Continuity mistake: At the race track, when Dylan jumps into the chauffeur's car, she says, "It's hot out there". A couple of scenes later, we see Creepy Thin Man rubbing a piece of Dylan's hair on his face, and breathing heavily. Look closely, and you can see fog coming out of his mouth. As we all know, that only happens when it's cold. (00:29:55 - 00:31:35)
Continuity mistake: In the scene where Drew Barrymore takes off her LL Cool J mask, you can see he had dark brown eyes before she takes the mask off. After she takes off the mask and flips her hair, her eyes are green. She obviously would have had to have worn dark brown contact lenses with the disguise, but there's no shot of her removing them. (00:05:00)
Factual error: When the girl fell from the building naked, those two boys were playing a playstation game - Final Fantasy 8. A two-player option wasn't introduced until the next game in the franchise, how come both of them are playing it at the same time? And they're just randomly hitting the buttons...
Factual error: At the beginning, a man says, "Thank You" and then something like, "dor je." The closed captions say it's Japanese, but it's really Chinese.
Revealing mistake: When the Creepy Thin Man's shooting at the Angels, Lucy Liu ducks behind a wall, and we see a bullet impact just above her head out of shot. When Thin Man runs out of bullets, Lucy peeks round the corner, and poking down from the top of the screen is what looks suspiciously like a wire from the explosive used to generate the bullet hit. (00:23:50)Jon Sandys
Visible crew/equipment: Just at the start of the fight in the alley with the Creepy Thin Man and the Angels, he charges them and is booted into the air. As he comes back down, Dylan and Alex kick him, but watch above Creepy Thin Man when they do. It shows a mid-chest level view looking up at Thin Man of their kicks hitting his collarbone. You can see the entire exposed ceiling of the stage they're shooting the scene on. It's supposed to be an open night sky in the alley. (00:25:28)
Continuity mistake: Drew's car is parked at an angle when she looks back at Chad before jumping in the car, but then when skidding out she's straight as an arrow. (00:08:05)
Revealing mistake: When Dylan gets shot through the window by Knox, the scene is then rewound and replayed in slow motion. The playback of the speech and video seems to be at normal speed with just the pitch lowered, although the Marvin Gaye song in the background is accurately slowed down. In the same shot when it cuts to Bullet Time, immediately after firing the gun, Knox blinks. We see his eyes close, then open while the bullet has traveled a mere 4 inches from the barrel. Assuming the bullet is travelling at over 1000 feet per second, Knox is not only quick on the trigger, but has the fastest eyes as well. (00:59:17)
Audio problem: In the scene where Lucy is transferring appointments from Corwin's palm pilot, she says "I got a schedule." When she says this, you can see her reflection, and her mouth doesn't move when she says this. (00:16:40)
Factual error: The bird that forms a major plot point is not a pygmy nuthatch, which looks completely different than the bird shown (an oriole, if I remember correctly). Also, pygmy nuthatches definitely aren't only found in that area of California (which was another major point made in the movie). They're actually found lots of places in the west and central US. Finally, pygmy nuthatches don't have a song anything remotely like the one that forms the rest of that plot point. Not a major mistake for most people, just for birders! (01:02:50)
Continuity mistake: In the scene where Tom Green's character is giving the Angels a ride in the boat, look behind the boat and you will see that the "frothy" ocean water churned up by the propellers only goes back a very short distance. The boat was obviously sitting in one place (drifting, actually) for a period of time and only started moving immediately before they started filming. (01:04:05)