Continuity mistake: In the locker room, after Dex's death, TJ punches Franz. Karl comes into the locker room and tells TJ to go home. However, a few seconds before the punch we see Karl come into the room point at Franz and say something. You can't hear it because the audio of his line was deleted.
Continuity mistake: When Joe and his wife are about to have dinner, he takes the salad bowls into the dining room and sets them on the corner of the table. He returns to the kitchen for a second and then when he enters the dining room again the bowls are on their plates. (00:30:20)
Visible crew/equipment: When D-Fens runs out on the pier, the movie lights are shown in plain sight on each side. (01:37:35)
Factual error: In at least two scenes, cars from the 1990's can be seen, despite the fact that the film took place two decades earlier. (00:50:00)
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).
Revealing mistake: While in the convenience store, watch the arcade screen the punks are playing, they are getting very excited about the game, however anyone who has played Street Fighter 2 will notice that they are merely looking at the demo version and even the words "insert coins" are displayed on the screen.
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: In the scene where Clarence is cleaning Alabama's wounds outside the airport (after she gets beaten up by and subsequently kills her would-be hitman), a large gaping cut seen on the left side of her face in one scene is gone in the next and does not reappear.
Revealing mistake: The oil lamp carried by Mary when she first finds Colin has a flame that never flickers, and is likely an electric lamp.
Continuity mistake: When Darian hits Cliff over the back with the attic pole, the brass hook disappears between strikes.
Continuity mistake: Just after Huck (Elijah Wood) hides in the piano, Mary Jane comes in to visit her dead brother in his coffin before they bury him. She sets down her candle and in the next shot a chair suddenly appears beside her to sit down.
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: There's a scene where Oldman is talking to his wife (Anabella Sciorra) in the kitchen. He is sitting at the table on which there's a candle. In one scene the candle is lit, in the next it has gone out. It also switched between flickering and staying still.
Factual error: Throughout the movie, you see Carlito using a Beretta 92F semi-automatic pistol. The movie is set in 1975, that model pistol wasn't introduced until the mid 80s.
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: 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.
Factual error: When the camera took a shot on a train coming to a station in Czechoslovakia, you can see electric cables above the train tracks. There was no such thing in Czechoslovakia as electrified trains in the 1940's. The electrification started in the 1950's. (00:01:05)