Revealing mistake: When the killer is attacking Cici on the balcony, you can see blood on Cici's back before she is even stabbed and both times she is stabbed, the knife that comes out of her back has no blood on it. (00:33:20)
Revealing mistake: When Jack and Rose are running from the raging water that is gushing down the hall after them you can see the faces of the stunt doubles through the computer generated ones of Leonardo and Kate (slow motion can help but isn't essential). (02:17:15)
Revealing mistake: When Holden is driving his Ford explorer, the speedometer reads that he's going 0 mph. (00:50:35)
Revealing mistake: Right after they "create" Leeloo and she is lying in the plastic cage with the little straps on her, the guy approaches her and says, "if you want out, you are going to have to work on your communication skills." She gives him a dirty look, and then you can see a huge hole, pre-cut in the glass, that she busts her hand through. (00:29:47)
Revealing mistake: At the beginning of the movie, when Melvin catches Simon's dog, he holds it away from him, with his arms stretched. When the dog begins to pee, you can see that the urine is coming out from Melvin's glove. (00:01:30)
Revealing mistake: There is one scene where Alicia Silverstone is being taken away, and in the window, in the background, you can see a metro train with the letters on the side stating BC Transit and a picture of the British Columbia flag. Yet, the whole movie supposedly takes place in Washington state.
Revealing mistake: When Andy and Claude are fighting each other in the train, during several shots, you can see Claude wearing gray briefs.
Revealing mistake: When Seaborn Legend hits the Eindhoven Lion, some of the sparks come from places that are not making contact. (01:30:00)
Revealing mistake: When Jude Law needs to pull himself up the flight of stairs to reach the intercom, you can see him use his hips, despite the fact that he is paralyzed from the waist down.
Revealing mistake: In the scene at the end, at the Newberry house, where Blank and Grocer meet in the kitchen, you can see that Blanks weapon is empty but he keeps shooting with it. It goes empty when he reaches over the counter to shoot at Grocer, but he still manages to shoot the two persons coming in through the door from the garden afterwards without reloading.
Revealing mistake: When Georgie stands up at the roof-top pond, she casts a shadow on the background sunrise.
Revealing mistake: When Guido tries to escape camouflaged as a woman and is stopped by the guards the second from right prisoner cannot help laughing. (01:50:10)
Revealing mistake: When the toilet cabin is pulled upright the chain hangs through long before the cabin stands vertically. (00:47:25)
Revealing mistake: When Fred Randall is in the motion sickness machine (the one that spins around horizontally), you can see the three people in the observation centre above at one point. Look at them closely, because they are fake.
Revealing mistake: When Katherine is doing cartwheels, her dress stays down in relation to her feet. It doesn't ride up or flap towards her upper body.
Revealing mistake: The background scenery in the outdoor shots doesn't look anything like Illinois, where the movie's supposed to be set. It's much more like what you'd see in California - where the actual filming took place.
Revealing mistake: When Magoo is skiing downhill, and the camera points directly at him whilst skiing, if you look to either side of his skis, you can see the tyre tracks of the vehicle towing him.