When the custom Dodge first shows up at Big Kays burger stand there is repaired damage seen on Packard's Corvette and Minty's yellow Trans Am (the damage is caused by shotgun blasts later on in the movie). Then when they get to road to race after this scene, the damage is gone.
When Rughead steps in front of Oggy's car and the Turbo to set off Oggy's race, Oggy's side mirror shows him wearing his helmet. In the next shot when he is shaking hands with Skank he is wearing no helmet but his sunglasses instead.
When the two cars (Packard's Corvette and the white Dodge Daytona) return from the race in the opening scene, the driver of the Daytona stops and switches off the lights. Later he walks away with his girlfriend and Packard's Gang gets ready to get off, but now the tail lights of the Daytona are on again, although nobody has gotten in already.
The Daytona the couple drives in the first race actually starts out as a 1986 model. Later in the garage scene before the wraith enters the gang is working on the later 1987 model with pop up head lights.
Oggie's dead body is described as - except for his missing eyes - looking like he just came out of a hot tub, yet when revealed he looks ghoulishly pasty with eye sockets that seem burned. Much later on, Packard's dead body looks like he's merely sleeping and would aptly fit the description earlier given Oggie.
When Minti's TransAm rolls over after hitting the Interceptor the right front wheel is completely broken off the axle. In the next shot when the TransAm hits the rocks the right front wheel is perfectly in place.
In the race between the Wraith and the red Daytona they come up on a Ford Escort that the Daytona has to swerve past. A few seconds later the Daytona swerves around it again. Also, during the race between the Wraith and the Firebird there is a brief point of view shot of a car swerving to avoid the same Escort.