Revealing mistake: After the woman is strangled and the people come in trying to find the little kid, the dead woman is clearly seen blinking. (00:11:25)
Continuity mistake: In the kitchen scene, when Frank's parents are arguing, the clock reads about 6:45 and then in the next shot, it is 6:15.
Continuity mistake: Towards the end, Denzel drives his car into 2 cars trying to get Ethan off the hood. After that scene ends you see Denzel driving the same car and the front and rear of the car look nothing like they did when he was crashing into the cars.
Continuity mistake: When Clarice is opening the letter written to her by Hannibal, it is sealed with wax, and not glued down in any way. While she's reading it, Hannibal is shown licking an envelope. (00:32:05)
Continuity mistake: When Felix looks out at the Anfield pitch you can see executive boxes on the opposite stand. He is meant to be in an executive box but can't be, as only one stand at Anfield has boxes. (01:16:20)
Continuity mistake: Near the end when Tiffany is spitting blood out she gets some smeared all over her face. They then cut to a camera above Virgil's head and the blood smear is gone, but when they cut back to the first camera she has the blood smear again.
Factual error: Worms are not created in AutoCAD. Ever. Period. Does not happen, cannot happen. Building design work and the like is done in AutoCAD. Viruses and worms are coded out by hand or created with a generator by slackers that don't know the code and then compiled into executables.
Plot hole: How could the police miss finding Cybil in the trunk of Michael Zane's car when it was in an impound lot? They would have definitely searched the car if he was found in violation of a federal offence (for carrying the weapons). Even if they didn't do a search, they would certainly have heard the sounds that Cybil would have made from being locked in the trunk.
Factual error: When the Betty Doll takes off, there is a rapid fire selection of different shots of how the craze is impacting the nation. During the baseball scene, the shot starts with a L.A. Dodger (Eric Karros) hitting a pitch from a New York Mets pitcher (appears to be John Franco). The shot changes to that of the baseball going into the stands... in Wrigley Field, home of the Chicago Cubs.
Continuity mistake: When Brittany Murphy writes down the number on the glass she writes it backwards because that's how she sees it in her mind. Watch closely, though, and you'll see a perfectly normal 2 which isn't written as a mirror image of 5. Later, when Michael Douglas realizes this catch, he looks at the piece of glass again, this time from the other side, and the 2 has turned into a 5, which apparently was written in a different style. (01:40:12)
Continuity mistake: After Jet Li has arrived in France and has left the cab, he is walking up a road which seems like China Town to find the shop with dragon in the window. As he arrives near the shop a prostitute with a long black jacket and red hair is standing and talking to a man wearing jeans. Then Jet looks at the picture and then at the dragon, the camera angle changes and as Jet is about to walk in you see the same woman standing against the wall and the man has done the Jet Li vanishing act.
Factual error: During the custody hearing, the Maryland flag in the courtroom is upside down. The rule for a Maryland flag is "black and gold, top of the pole," this flag has the red symbol at the top.