Plot hole: The plot that a piece of the Roman spear that pierced Christ ends up in a hidden Mayan temple in the Amazon (which is nevertheless still full of gold etc.) makes no sense.
Plot hole: In the waning seconds of the championship game, the Huskies are down by 2 and UMass has the ball. Not only do the Huskies not intentionally foul to stop the clock, but UMass attempts to run a play and set up a basket when they simply could have dribbled out the clock and won the game. Both these strategies go against what any basketball team would do in this situation, especially in a championship game.
Plot hole: If the curse counts an eclipse as night, then Navarre should have turned into a wolf during the eclipse. If the curse does not count the eclipse as night, then Isabeau should have remained a hawk. In neither case would they both have been human at the same time.
Suggested correction: That is the whole point; it is neither day nor is it night. Each only suffers the curse when it is specifically day or specifically night. Any time it is not one of those two events, the curse is not active, as shown earlier in the movie when both are human for seconds during a time in between day and night.
Plot hole: It's never explained why Frances Parker would be upset about Cay pursuing Vivian. She knows she's gay, but we're never told why she's mad.
Plot hole: Greg suddenly wears Jack's "breast" during the "monkey business" scene with a crying LJ. But the only time we see it is in the RV which Jack would most likely have kept locked up. How did Greg get ahold of it?
Plot hole: Helena is ordered to fly or be thrown off the tower, bearing the brunt for Simon's failure. But the flying apparatus is still up there, and so is her servant who was going to secretly operate it so that Simon could pretend to fly around. All she needs is right there in front of her. She's supposed to be cunning and resourceful, and she could have saved her life simply by following the original plan.
Plot hole: Marcus told Melena he lived in New Mexico with his parents until he was 5 years old: "My dad died in a car accident when I was five... and my mom got caught smuggling people into the country, so she got 10 years [in prison]." Even though Marcus did not know at the time the real reason his mother was in prison, the murder must have occurred in New Mexico, so it doesn't make sense that she would be serving time in a New York prison. (00:33:20 - 00:34:21)
Plot hole: In the yearbook scene Tim barges into Jamie's room and asks her to sign his yearbook, pushes Chris off the bed, and they somehow get their yearbooks mixed up. Tim's yearbook is left in the room with Jamie and Chris, while Tim takes Jamie's yearbook that Chris wrote in with him. When Chris asks Jamie to read the message he wrote in her yearbook, she instead reads the message that Tim wrote to her in his own yearbook. If Tim was asking Jamie to sign his yearbook, why would sign the yearbook with as if he was signing Jamie's. If he was intending to sign Jamie's yearbook, he would have written in the same yearbook that Chris wrote in and not his own.
Plot hole: The female employee says he's going to inherit everything, he gets it all. No he only gets 51%, the 7 dwarfs still make many decisions. (00:10:37)
Plot hole: Mr. Cranston asks Denise to be the accompanist for the school's production of "Chicago". This is an error. In the year 2009, in which the film is set, this would be impossible since the licensing company which has the theatrical rights for "Chicago" restricts the show from being produced (even by amateur groups and schools) anywhere in the greater New York area while there is an open-ended production running on Broadway.
Plot hole: The main character never takes the elevator. He only takes the stairs. When leading a workshop he leads a group of people from street level by saying 'follow me' and in the next shot the whole group is on top of a high rise hotel. How did he and the entire group get from street level to the roof together if he never takes the elevator?
Plot hole: In the morning at the motel, the vampires have a big shoot-out with local law enforcement, which results in one at least one cop being killed. But when they escape, the police don't bother pursuing them or even giving them a another thought. Even for an 80's film, this is beyond ludicrous.
Plot hole: Just before the bomb explodes at the beginning of the movie, the guard is looking for the car playing 'don't worry baby' on it's stereo. In the final timeline the disaster has been averted, the bomb having gone off, and the ferry docked. After this, when Carlin is in the car, the same song is playing, but the bomb was set to a timer.
Suggested correction: That's why the movie is called Deja Vu and thats why Carlin gives the girl such a strange look. The song triggers a feeling of Deja Vu for him and it almost feels to him that he knows her. Besides, a different station could have been playing the song.
Suggested correction: The first time it plays comes off the radio. The second time we hear it mid-play. It could have come from a different station, the same station could have played it again later, or a CD or cassette being played in the car.
Plot hole: Harry goes into the Mall, and two of the terrorists follow him through the Mall, up the escalator, down the hall, and into the men's room. Then the third terrorist leaves the car and follows exactly the same path to where the other 3 went, even though there's no way he could have known exactly where to go.
Plot hole: When Buckaroo is speaking with the president via video call (with John Parker by Buckaroo's side), New Jersey is explaining the reason humans can't see the aliens from planet 10, is a result of bacteria produced by the aliens which is then absorbed by humans via their olfactory senses, affecting their cerebral cortex. If this is the case, why doesn't the president see John Parker in his true alien persona. He can't smell him through the television. (01:04:50 - 01:05:40)
Plot hole: Chelsea says that when her deceased father gave her one of his paintings (now missing), he wrote an inscription to her on the back. She says she cannot prove that he actually did this other than he noted it in his journal and she does not know where the journal is. However, when Chelsea's father presented the painting to her on her 8th birthday, there were at least 100 adults present at her party who witnessed him giving her the painting, writing the inscription, and signing his name on the back of the canvas which was displayed to the guests. Any number of these people could be contacted and corroborate her claim.