Revealing mistake: In the scene where Cully injects Sonny in his back, you can see that just just after he pushes the plunger, the spring mechanism moves on the inside of the syringe. He is not actually injecting Sonny, but the needle retracts on a spring loaded mechanism into the syringe. (00:14:40)
Hooper (1978)
1 revealing mistake - chronological order
Directed by: Hal Needham
Starring: Burt Reynolds, Sally Field, Brian Keith, Jan-Michael Vincent
Continuity mistake: 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.
Singer: Everyone get drunk and be somebody.
Trivia: When everyone's back at Sonny's ranch watching his old stunt films, the footage with him getting thrown from a canoe in a river was from his movie "Deliverance".