Corrected entry: Gary Oldman originally wanted to share top billing with Anthony Hopkins and Julianne Moore. When the producers denied his request, he declined to have any billing at all and, in the original theatrical release, remained uncredited at the film's opening and closing credits. However, he is credited in the VHS & DVD releases.
Corrected entry: In the scene where the woman and Mason match the fingerprint to Dr. Lecter they use a computer. In no part of the fingerprinting process do you use a computer, even for a match.
Corrected entry: In the scene where Francesco Pazzi calls the Credit Suisse bank in Switzerland he uses an impossible number: 004122xxx instead of 0041800xxxxxx which would be a toll free Swiss number. (00:48:57)
Correction: Probably done intentionally to avoid crank calls, much in the way they use 555 for American numbers.
Corrected entry: Inspector Pazzi has to enter a user name and password to view the FBI's Ten Most Wanted list. The list is freely viewable by the public and no information has to be given.
Correction: He's logging in to a private area with more detailed info.
Corrected entry: After giving the presentation with Inspector Pazzi in attendance, Hannibal disembowels him and hangs him from a balcony of the Palazzo Vecchio. Moments earlier, Hannibal shows Pazzi a projected art rendering of his ancestor, Francesco De Pazzi, hanging from a rope and tells Pazzi that he was "hanging beneath these very windows." Clearly he's talking about the windows of the Palazzo Vecchio, since that's the building that they're in at the moment. The problem is, the Palazzo Vacchio is unmistakably seen in its entirety far off in the distance in the art rendering.
Correction: Hannibal actually shows Pazzi two slides that are apparently unrelated. In the first, the Palazzo Vecchio is seen in the distance, but there is nobody being hanged in the foreground. Hannibal tells Pazzi it was the one he had told him about (but it's not) and asks Pazzi if he can "make it out." It's a trap. Pazzi looks at it inquisitively and takes steps toward it. As he does, Hannibal switches the projection to a slide of Pazzi's ancestor hanging, with an unidentified wall in the backdrop that could indeed be the Palazzo Vecchio (this is the one that he had told Pazzi about before).
Corrected entry: In the scene where Clarice is asking Barney where all of Dr. Lecter's belongings from the hospital are, Clarice mentions that Dr. Lecter's drawings are missing. The drawings are not missing. Clarice gave them back to Dr. Lecter at their final face-to-face in "The Silence of the Lambs."
Correction: Lecter didn't take his drawings with him when he broke out, so they were left with his other possessions, which would have been stored away somewhere. Presumably they are no longer there, implying that somebody, probably Barney, has removed them from the storage facility and sold them.
Corrected entry: When Inspector Pazzi visits Hannibal to pick up the previous librarian's belongings, Hannibal steps into another room and dons a pair of gloves on the excuse that the building is very cold. At least two shots during the scene, however, he is walking barefoot on the stone floor.
Correction: Lecter has to give some excuse for putting on the gloves - he can hardly say "I'm a wanted psychopath and I don't want you to get my fingerprints". Given that he's barefoot, the excuse isn't particularly good, but he doesn't have the time to come up with anything better. Pazzi may not pick up on it, or, if he does, he doesn't say anything, but that's a character mistake, not a movie mistake.
Corrected entry: When Lecter is in the hospital stealing the autopsy equpiment, he closes the door after a man walks through rolling a corpse. Most people probably didn't notice or realise, but when he closed the door, he was actually locking the man in the freezer - that is why the orange light began to flash, as an alarm. The man would have frozen or sufficated soon if not retrieved. Just another murder or at the very least attempted murder of Lecter's that went unnoticed. (01:28:42)
Correction: The freezer door had a latch on the inside that is clearly visible before he closes it. These interior latches cannot be locked, even if the outside latch is locked, to prevent this exact occurrence.
Corrected entry: In the scene just after Starling's visit with Barney, she is listening to a tape of a late night conversation between Barney and Dr. Lecter (where the good doc was comparing Starling's behaviour to that of a Roller Pigeon). This tape shouldn't even exist given that Dr. Chilton was supposedly only taping Lecter's conversations with Starling. Even the empty tape case is labelled "Lecter and Starling", yet only Lecter and Barney are on the tape.
Correction: They key word here is "supposedly". The good doctor Chilton was taping other conversations Hannibal had, and lied about it afterwards. The reason being that Lecter was his most famous inmate, and any new information from him would be worth gold. And then, in a feeble attempt to cover up, he labelled the tape as a legit recording.
Corrected entry: In the scene where Clarice has to give up her gun and badge before she goes home, her earrings change from studs to hoops.
Correction: She has changed from her work clothes before heading up to her lake house. It is not out of the question that she would have changed earrings as well.
Corrected entry: The FBI agent recieves a message from Dr. Hannibal Lecter, which has 2 folds in it. While the agent is reading the letter, it shows Lecter in Paris, when he was writing the letter. Before he puts the letter into the envelope, it shows him fold the letter only once, but when the FBI agent opens the seal and takes it out, the letter has 2 folds in it.
Correction: When we see Hannibal fold the letter, there's already one fold in it, making it look like he's folding it in half, when in fact he's just finishing the tri-fold.
Corrected entry: In Hannibal, Clarice says that in Memphis, Lecter killed 3 police officers during his escape. However, in The Silence Of The Lambs, he is seen murdering 2 police officers, and is later mentioned killing 2 paramedics and a tourist. (01:09:51)
Correction: Just because he is only 'seen' killing two police officers, he may very well have killed a third, off-screen, during his escape.
Corrected entry: When Hannibal has Pazzi duct-taped to the carrier, Pazzi can clearly still move his head around, so why in the world does Hannibal instruct him to answer 'yes' or 'no' by blinking, instead of simply nodding his head? (01:16:01)
Correction: So that Pazzi becomes confused. He later asks him "was that a yes or a no?" He has imposed the blinking rule because Pazzi is panicking and he almost wants him to make a mistake. It's part of his mind games and torture.
Corrected entry: During the initial FBI operation, you'd think that if Clarice didn't want to blow the agents' cover she'd have worn a hairstyle that would have concealed the otherwise very obvious earpiece from her radio.
Correction: Her earpiece is very small and skin colored. And is very hard to detect unless if you are right next to her. She doesn't need to disguise it further.
Corrected entry: In the scene where Pazzi meets with Lecter in the Capponi Library, at one point Lecter walks behind Pazzi while speaking and the white parts of his dark blue pajamas can actually be seen on top of Pazzi's trench coat. This is because the two shots were in fact spliced together to account for the actor's movements on screen as they spoke. (00:52:21)
Correction: The white in the image is simply Pazzi turning the white pages of the document he is looking at.
Corrected entry: When the thief Lecter stabbed is lying dead in the street, you would think that in a street full of people that someone would notice a dead man.
Correction: The inspector is with the thief entire scene, covering him in the corner. There is no reason why somebody wouldn't have noticed him right after.
Corrected entry: When Clarice is talking with the other agents about Mason they say he was upset when the FBI took Hannibal off of the 10 most wanted list, but when the Italian inspector accesses the FBI's most wanted list Hannibal is still on it.
Correction: In his phone conversation with Clarice, Lecter comments that he has been elevated to the ten most wanted list - obviously they decided to put him back again.
Corrected entry: In the scene where Drumgo's henchmen shoot it out with the FBI, the thug carrying the diaper bag has no weapon crossing the street. Right before he pulls the shotgun out to shoot at Bolton, it's obvious that it was too large to have been hidden in the bag the entire time.
Correction: Watch the "Anatomy of a Shootout" on the special features part on the DVD. It shows him pull the gun out of the bag.
Corrected entry: In the movie "Red Dragon", the police do not have a clue that Lecter is a serial killer until he attacks Will Graham. In "Hannibal", it is stated that Mason Verger was Lecter's 4th victim, the only one to survive. Wouldn't Verger recognise Lecter if he was a famous psychiatrist?
Correction: Being that Verger was most likely close to death, and seeing the amount of damage that was done to his face, It is reasonable to think that Verger was incapacitated when found by the authorities.
Corrected entry: While Julianne Moore and Anthony Hopkins are talking in the mall, Anthony Hopkins's hair is plainly grey. Later, at the gruesome dinner party, his hair is a great deal darker, almost black.
Correction: He has dyed it, wishing to look his best because he is going to a dinner party with a lady.
Correction: That isn't true at all. Gary Oldman wanted the audience to 'watch' and 'listen' to the character and not be distracted by his stardom. Furthermore Oldman is well known for cameo roles and isn't a prima donna as your comment suggests.