Audio problem: In the big fight sequence towards the end, when the two Lamborghini babes are rescued by Captain Chaos, one of them says, "You're so macho," but the girl's lips aren't moving. (01:18:15)
Continuity mistake: Roger Moore is in the crowd at the finish line as Dom Deluise and Burt Reynolds are talking to each other. A few seconds later you see Roger Moore's car driving to the finish line.
Visible crew/equipment: When the Sheik arrives at the hotel he gets out of his car and is talking. On the ground is a clear shadow of the boom microphone.
Visible crew/equipment: At the construction site, J.J. trades insults with Sammy Davis Jr. and Dean Martin. As Sammy says his line "A LOT of them!" you can see the boom mic and camera crew reflected in his glasses.
Other mistake: When the Japanese car passes the troopers sitting by the road, they're going 125 miles per hour by their speedometer. The trooper says that they're doing 125, but the radar readout says 20.
Revealing mistake: When the two Japanese racers are stranded in the desert, they activate the secret rocket weapon. The stream of smoke that is supposed to be generated from the rocket appears to be coming from underneath the rocket, just above the rear bumper. (01:13:05)
Continuity mistake: A cop pulls up beside the two guys driving the GMC, and the driver yells to the cop that he has no brakes, so the cop moves along. The two guys laugh about it as next shot suddenly shows train tracks 1,000 feet ahead of them with a bunch of people working on a railcar, and a roadblock sign out front.
