Revealing mistake: There are 4 different vehicles in the movie that have the same license plate number (2PCE275). The first is on a white car owned by the gang member that shoots Max. Then you see the same plate number on the pickup truck of the skinheads that are harrassing Gary. Then you see the same plate on Steven Seagal's car as he drives away from saving Gary from the skinheads (incidentally, the front plate on his car is different than the back plate). The last time you see the same plate is on a Lexus driven by the guy in the all white suit who is going to buy the cocaine.
Revealing mistake: Rachel slides off her panties while trying to seduce Harlan, and when she offers to let him "touch it", she parts her legs slightly and it can be seen that she's wearing another pair of panties.
Revealing mistake: When Will and Jon are doing their final skate and Will breaks his ankle and they have to switch position in the final routine, they are skating around getting ready to do it and Will lifts up his broken ankle so Jon can grab it. When he grabs the broken ankle, Will shows no sign of pain, but earlier when he tried to skate on it, he screamed in pain.
Revealing mistake: In the scene at the beginning of the film when the bus enters the village, you can see that the road signs are on the left side of the road (not facing the bus) and the continous line that separates the two ways is on the exit of the curve, not before the curve. This is because the action of the movie is set to happen in England but that scene was filmed in Romania, a country with right-hand traffic. (00:03:20)
Revealing mistake: During the bidding, the girls' pictures on the phone are obviously super imposed images and not really the picture phone screens.
Revealing mistake: In the beginning when Nick gets a present from Fred you see that the background is fake.
Revealing mistake: When the zombies are eating the intern in the hospital, you can see one of his ribs move as if it were made out of rubber. (00:51:20)
Revealing mistake: The first morning, when Robert takes Giselle to work, they enter atrium of the Time Warner Center (the well-known statue of the female Giselle admires is one of a set, the other is male), which is located at 8th Ave and Broadway, at the southwest corner of Central Park. Upstairs, when Sam tells Robert that she can't find where Giselle is from, and then when Giselle speaks to Phoebe, the very distinctive Johnson Lipstick Building (it's reddish and has three receding oval-shaped levels) at 53rd and 3rd is seen outside the window. The office scene is obviously not filmed at Time Warner, because it's impossible to be in an office at 8th and Broadway, on the West Side, and be next door to a building located at 53rd and 3rd, on the East Side. (00:35:40 - 00:40:35)
Revealing mistake: When they blow up the whale, it is obvious it is just a large prop, as there isn't much blood or tissue flying through the air. You can tell by comparing it to the famous news reel online that shows what happened when the exact same thing happened in real life.
Revealing mistake: When Holly is in bed with William, and then finds out that he is 'Billy from the band', just as she pulls away from him to bolt out of bed, the modesty top she wears is quickly seen.
Revealing mistake: The scene where the camera pans the stadium about 3/4 of the way through the film looked like a scale model with a fake background.
Revealing mistake: When the police dog wants to attack Swagger and bites the cop instead, it's obvious the cop wears thick protection under his coat sleeve. (01:03:20)
Revealing mistake: As Aurelius and Wulfila fight, one shot after Aurelius lifts a long-handled battle axe, we can see two shots with a jet contrail in the sky, which were impossible in the 5th century AD.
Revealing mistake: When Cris drives his car over the railroad crossing, the CGI locomotive which passes subsequently lacks a fuel tank which is usually between the two sets of wheels.
Revealing mistake: Sean Patrick Flanery plays a nerd who has trapped a female vampire in a cage. About 3/4 of the way into the movie, he tricks a co-worker into visiting, planning to feed him to her. He extends his right arm through the bars, and she starts to caress and kiss it, then begins to bite it and suck his blood. When he tries to withdraw, she tears off his arm at the shoulder. But in the next shot, he and Flannery both hit the floor outside the cage, and the co-worker's right arm is visible. However, when the scene begins, both Flanery and the co-worker are wearing watches on their left wrists, and in the shot of them on the floor, both have watches on the right, suggesting that the image has been reversed.
Revealing mistake: After Steven Wilkins disguised as a vampire kills the unnamed woman he closes her eyelids to make it look like she's asleep. Just before his hand contacts her eyelids you see her almost blink, revealing she's very much alive.
Revealing mistake: In the bedroom, when Cassandra asks about what Jane has been writing and Jane answers, "Just something I started in London", when Jane gets up and moves to the table, it is obvious that she is wearing a g-string under her nightgown.
Revealing mistake: In the jazz club, the saxophone player's finger movements don't match what he is playing.
Revealing mistake: When Edward and Carter are driving a motorcycle across the Great Wall, you can see that the man sitting on motorcycle is not Jack Nicholson. He has been replaced by a bit too obvious stunt double.
Revealing mistake: When Billy is looking at Nick's driver's license, for sex it says F for female.