Visible crew/equipment: When Donna and her boyfriend leave his family's house in the end, in the front window of the house you can see a white van and film crew.
Continuity mistake: When Helen puts the trashbag down, with the teddy on top, the teddy's scarf hangs down over its face. But when Gypsy picks it up, the scarf is no longer hanging over its face.
Continuity mistake: When Isabelle arrives in front of Roxy's apartment, you can see the cab driver close the trunk after he removes Isabelle's bags, but when Charles-Henri hands the driver his bags a moment later the trunk is still open.
Continuity mistake: Marion isn't wearing any clothes as they enter the convenience store. However, as they are standing in the doorway you can see he is wearing boxers.
Audio problem: When Steve is thanking Melissa for marrying Mark, the bride turns out to be Angela. Angela knocks Steve to the floor and grabs a gun from under her wedding dress. You can hear the sound of a hammer cocking but the gun turns out to be a hammerless automatic.
Audio problem: When Zero and Marcel are fighting over the music near the beginning, the music regularly changes before their fingers reach the buttons.
Revealing mistake: Katie Holmes appears to have a bandage on her finger way before she actually gets hurt. When Bobby hangs the turkey drawing on the door and she kisses him goodbye, the bandage is on her finger, but it's not until she peels the potatoes that her finger is cut. (00:14:25 - 00:24:50)
Continuity mistake: At the very beginning of the movie, Rachel Leigh Cook drops Doleman off at the bank and he says, "I'm going to go in there and blow them away." At the end of the movie, when the scene is replayed from a different camera angle, he says, "I'm going to go and try and blow them away."
Audio problem: Just after Molly gets fired and she sees Neal while crossing the street, he says something like, "...been able to write a decent song since I last saw you..." His lips don't match what he's saying.
Factual error: In the scene where Tom and O'Malley are talking in O'Malley's flat, the chessboard in between them is set up the wrong way round.
Revealing mistake: In the scene where Phil Kaufman is in the hospital searching for Gram Parsons' body, he pulls back the sheet covering the body and the actor playing the corpse moves his eye - the right one to be precise.
Factual error: The final episode of "The Lucy-Desi Comedy Hour" when Lucy meets Ernie Kovacs, marks the finality for Lucy and Ricky Ricardo, and Fred and Ethel Mertz. By this time the shows weren't filmed before a live audience the way it's depicted in the movie. The producers of the show abandoned the live audience earlier than the final shows.
Continuity mistake: In the "No Problem" scene, Alex lights up a cigarette while waiting for Isaach and then leaves it in the ashtray. Later on, when Isaach finally arrives, Alex offers him a cigarette and lights one for himself. The cigarette left in the ashtray disappears in the next shot.
Continuity mistake: When Fin meets Emily in the Mill Bar, the amount of beer in his glass goes up and down without him buying a round or replenishing his glass.
Other mistake: When Alex shoots the harpoon and the old lady is returning to her apartment, Alex puts back the harpoon on the mantle and the rope of the harpoon is neatly folded back up. He wouldn't have had the time to properly do this by the time she returned.
Continuity mistake: When Jason Lee is driving the car over the humps in the road, Julia Stiles is in the passenger seat. In the shot before they take off Jason Lee is in the driving seat, when they show the shot of the car in mid air Julia Stiles is now in the driving seat, and in the shot as the car lands they are back in the right seats.
Other mistake: Sam asks Leo if she can see his gun, then she points it at him. He laughs and says the clip is removed and that he would never have let her have a loaded gun. She shows him the clip she has stolen from his pocket, loads it into the gun, and cocks it. When she cocks it, a round comes out, meaning that there was already a round in the chamber, so he did give her a loaded gun. She only had one shot, but it was still loaded.
Continuity mistake: In the scene at Mr Bingly's ball, where Lizzie is looking for Charlotte, she obviously notices her and starts walking towards her with her arms stretched out, palms down. In the next shot, her palms are turned upwards to take Charlotte's hands, who have hers palm down.
Continuity mistake: As John first checks in at the Baker motel, the pen on the desk shifts between shots. It's on a chain and certainly would make some noise if either character had moved it. (00:10:45)
Continuity mistake: During the coverage of a bingo game, the caller said B-8. Immediately the shot changed to a player covering N-38.