Continuity mistake: When being shot at by the angry waiter, the right hand door mirror was hit by the rifle shot. A few seconds later a view shows only a very minor hole in the glass, and no damage to the rest of the mirror. Surely a rifle shot would have caused more damage to plastic and chrome trim, almost surely passing right through. (00:30:20)
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.
Continuity mistake: While Susan and Charlie are passing notes towards the beginning of the film, her cell phone (a Virgin Mobile endorsement plug) continues to flip from a lying down position to a propped up position on her desk between shots throughout the scene.
Other mistake: There's a scene at the end of the movie where Annie is sitting looking through some graduate school brochures, and her boyfriend Hayden comes over and hands her a letter from the "5th Avenue Mom" she used to work for. She says she can't read it so he offers to read it to her. The camera shows a close-up of the letter as Hayden starts to read. In the letter it's written that it's been "some time" since we've spoken, but he reads it as "several months."
Continuity mistake: When Nikki and Kat are sitting on the floor in a secluded part of the library, there is a single book lying flat on the bottom shelf in front of them, with the binding facing out. In the next shot the book has changed position.
Continuity mistake: There's a scene in Kate's restaurant kitchen where Nick asks Zoe to hold the big bowl of spaghetti he had been eating, and she starts eating it. At one point there's a piece of basil hanging off the edge of the bowl and when the camera cuts back to her, it's gone.
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.
Continuity mistake: After arriving at the mountain cabin, Terry comes in to the bedroom and notices Diane has fallen asleep while working. At first, her laptop computer is screen-up on her lap with the stylus in her hand. But just before Terry leaves, the laptop is screen-down and the stylus is gone.
Factual error: When the two nuns strip to join Lorenzo in the bathtub, they both have bikini tan lines, hardly an everyday occurrence during the 14th century.
Continuity mistake: When Richard and Nikki get caught in Teddy's apartment the sweater that Nikki is wearing keeps changing from being zipped high to zipped low.
Continuity mistake: In the scene where Mackenzie's father is at the grill BBQing, you see a remote control in his shirt pocket. The remote control disappears and reappears in several shots.
Other mistake: Just before Debbie takes her shirt off after Walter has given all of the Playpen girls suggestions, one of the girls says "It's hot in here." (probably Debbie, but it doesn't really sound like her), but Mona doesn't start having an orgasm, when "in" is supposed to start it. (00:33:50)
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.
Continuity mistake: When the girl is looking up the fire engine in the oversized book, the little blonde boy in the red T-Shirt on the stool next to her changes the position of his head and hands between shots as she brings the book to the desk.
Continuity mistake: In the scene when Dawn is sitting on the edge of the tub after her shower, her "purity ring" switches from her left hand to her right and then back to her left hand in between close up and wide angle shots. (00:40:25)
Continuity mistake: In the scene where the Solomon brothers meet the ex-boyfriend James in ch 11, they grab "weapons" to defend themselves. John chooses a rolled up magazine and Dean chooses a small chimney broom, bristle side up (around 33 mins 10-17 secs in) but at about 33 mins 18 secs, the shot shows the small chimney broom's gold handle facing up and then at 33 mins and 20 secs, it is bristle side up again. It happens again at 33 mins 25 secs to 28 secs. (00:33:15)
Continuity mistake: In the scene just after the bathroom scene where she dumps the weed into the toilet, Jane writes the smiley in the sky and soon afterwards dumps her purse onto the sidewalk. Her cell phone (which was destroyed in the kitchen incident) falls out among the other items, without a scratch on it.
Other mistake: The window in which Ben climbs in at Reverend Frank's house seems too narrow when viewed from the outside. But in the next shot inside the house, the window is wider.
Continuity mistake: When Lars approaches Margo in her booth in their office, you can already see some letters in the third line of the last paragraph on her screen. When he is leaving, she continues typing, but there, you see her just beginning the third line. (01:08:00 - 01:09:00)
Factual error: No army flight from Georgia to Iraq would cross central Mexico.