Continuity mistake: Early in the movie, the kids go moto-surfing and the jeep they are riding in changes from having a door to not having a door.
Continuity mistake: When Regina tells her boyfriend to put the leash on the dog, he goes to do so but when you see his hand clip the leash on, the shot changes to a woman's hand clipping the leash on (the nails are covered in nail polish).
Continuity mistake: When Jacquouille is eating on the floor of the living room, the amount of food changes from shot to shot and when Béatrice notices the flooding, his dish is not there.
Revealing mistake: Doesn't it seem odd to anyone that the crops hadn't been reaped by Thanksgiving in South Dakota?
Continuity mistake: After Nathan pours the gasoline and throws the match in the well, we see a canister and shotgun sitting by well. But when the well explodes, they've disappeared. (01:23:50)
Revealing mistake: In the final scene when Annie and Sam are exiting the observation deck coming towards the elevators, the New York skyline backdrop which should be visible behind them is missing, and the entire sound stage wall can be seen beyond the observation deck safety railings instead. 'Although the exterior and lobby of the Empire State Building, 350 Fifth Avenue at 34th Street, are the real thing, a slightly larger replica of the Observation Deck was built in a hangar at Sand Point Naval Base on Puget Sound just northeast of - where else? - Seattle.' https://www.movie-locations.com/movies/s/Sleepless-In-Seattle.php. (01:39:35)
Continuity mistake: One of the tiles comes loose when Wallace is walking across the ceiling in the museum. A few seconds later, the tile is flat against the wall again.
Continuity mistake: When the Turtles are climbing the wall to get into the garbage-chute that leads to the prison, you can see Donatello's bandana tail hanging down towards the wall just as if they were crawling on the floor. (01:09:05)
Factual error: During one of the scenes, you see a guy on a motorcycle wearing a Misfits jacket. The movie takes place in '76, but the Misfits didn't form until '77.
Continuity mistake: When Sam is making grilled cheese sandwiches with the ironing board and iron, he finishes one sandwich and places it on top of another on the side table. After Joon's explanation of cheese and culture the camera cuts back to Sam placing another finished sandwich on the side table on the same place that he placed the first but there is only one sandwich there where there should be two.
Continuity mistake: In the scene where Beldar has finished giving Gladys a driving lesson and they are sitting in the car, you can see that he has nothing on his lips. After Gladys kisses Beldar, you can see red lipstick. As the shots go from Beldar to Gladys and back, you can see the lipstick disappear and re-appear.
Revealing mistake: When Michelle is binding Topper's hands to the bed you can see the cloth hiding her breasts. (00:30:30)
Continuity mistake: Bernie gets shot underwater with the spear and can't let go of the chest. But when they take the vest off Larry to float Bernie up to the surface, Bernie takes his hand off of the handle to get the vest on.
Revealing mistake: When Wayne has gone to the church for Cassandra and finds out that it is actually the one across the street, he walks across between them. If you look where the sun is coming from, his shadow is actually in the wrong direction when he is between them. (01:18:10)
Continuity mistake: In the scene, towards the end of the movie, Billy Baldwin is running down the street chasing the cab that the girl he wants is in. His shirt changes from having a pocket to not having a pocket. The colour also changes from yellowish to more brownish.
Other mistake: After Molly crashes the taxi, she is standing outside in the bitter cold. Yet you never see her breath (vapor) when she is speaking or when she is huffing and puffing when confronted by the wolf.
Continuity mistake: This movie has many flashbacks to the late 1970s or early '80s, but in one scene the little boy is in his pajamas and it depicts symbols of NHL teams. Half, if not most of those teams were not around at that time.
Visible crew/equipment: When Emilio and Sam arrive at the "Squealer's Motel" and get out of the car, the camera man and sound man are visible in the window behind them as they walk towards the group of police.
Continuity mistake: When the bus is coming to pick up Alfre Woodard as she is finally meeting her son, we see Robert Downey, Jr. briefly touch her on the shoulder. Since she's a soul, this is impossible.
Audio problem: In the scene where Tyler is preventing Whoopi Goldberg from sitting down by asking her stupid questions, there is a part where Frankie says, "Oh you're gonna get jumped after school Tyler." When the word "Oh" is heard, his lips aren't moving.