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Towards the end of the film when Billy runs at the top of the screen towards the exit of the jail, you can see the film crew at the bottom of the screen.
Near the end of the film when Spider Mike is rescued from a town. The Rubber Duck's truck is damaged. It looses the bullbars on the front, and the windbreaker on the roof is flattened against the roof of the cab. Yet after leaving the town, in a series of shots showing the Rubber Duck's truck. The damage disappears or varies. The windbreaker appears fixed and so do the bars, yet in the next shot just the windbreaker is fixed and the bars aren't. It continues like this through a montage and then in the next scene when it cuts back to a close up of the truck both are damaged again.
The boys go deer hunting somewhere in the Appalachians, but the geology is all wrong. That scene is in North Cascades National Park in Washington State.
In the scene in the Beatles hotel room where Nancy Allen comes out from under the cart with the cokes on it, when she first sees the Beatles' guitars, notice that in the very first scene, the Hofner bass is left handed (the pick guard is on the left as you're looking at it), then it cuts to her, then when it cuts back to her rolling on the floor with the bass, it's suddenly right handed, then when in the last scene with her handling it, it's left handed again.
One can easily see that was not a Trans Am that made the big jump, but whatever it was mysteriously turns back into one when it lands on the other side.
In the final chase between the pickup and Firebird, the two cars pass the same Chevrolet Blazer (pale blue with a white top and rear-mounted spare tire) four times.
In the scene where Bette Davis has lost her shawl there is a shot of her and Maggie Smith from far away. They talk about the time and in the background Angela Lansbury is drinking. She puts down her glass and leans her head on her hand. Then the shot changes to a close-up of Bette Davis and Maggie Smith and you can see Angela Lansbury in the background, with the glass in her hand, just about to take a drink.
When Cheech and Chong are parked in their car smoking a joint, the car is filled with smoke. The smoke must come from a smoke machine outside as it is moving around very fast as if blown by the wind.
There's one bit where we see the shark slamming into a boat and gliding along the side with its mouth open. Not only does the shark's latex mouth bend beneath the snout, narrowing from pressure, but within the mouth you can clearly see yellow hydraulic tanks to open the mouth.
When Douvier asks Simone to 'come in here for a moment' there is a lamp and bust and 2 golden animals on his desk. Simone enters and there is a different shot of his desk - those three items are now in completely different places relative to each other.
The movie takes place in Chicago, except for one scene that is supposed to be in New York City (when Damien's uncle visits the priest). Two problems. First, as the cab pulls up to the church where the priest is, it goes past a housing project. Anyone who knows public housing construction in New York and Chicago knows that building is in Chicago. Second, when they go out to a trainyard, you can clearly see the Hancock Tower in the background. Of course, that building is in Chicago, not New York.
During the crop-duster chase with the helicopters, the interior of the filming helo is visible on the left side of the frame for a brief moment. Very noticeable.
As Max is carrying a birthday cake out of the kitchen, the candle blows out as he walks. But the candle is suddenly lit again when the camera angle changes, as he walks into the living room.