Deliberate mistake: In the lab, when Eddie is riding his motorcycle on the upper level in the wideshots, the stunt double is rather obvious despite the added padding, due to his slimmer face and non-chunky arms.
Deliberate mistake: As George is speeding after Jackie on his motorcycle, in some of the shots as he rides past the camera it's apparent that it is not Warren Beatty in these shots but a stunt double, unlike other shots where it is Warren on the motorcycle. (01:42:20)