Continuity mistake: When Molly dismounts her horse near the end of the movie the blanket slides off. A second later the blanket appears back on the horse.
Factual error: On their journey, Rooster is bragging about his navy colts, when actually his sidearm is a Colt .45 Peacemaker, also known as an Army Colt M1873.
Continuity mistake: After Willy Clark has a heart attack, Al Lewis goes to his apartment for a visit. Willy's nephew Ben is standing between the two men with his right hand resting across his stomach. In the long shot, his right arm and hand are alongside his body.
Continuity mistake: When Gary is in the restaurant with Julia he writes out the card asking Joe Baker to join them. As soon as Gary picks up his pen the angle changes and the note is written in full.
Factual error: This film is set in the 1960's. The Ford transit van belonging to Russell, the group's roadie, is a facelifted 1971 model.
Continuity mistake: Friday is at the fashion show, and after arguing with her friend who called her on NYE, she is talking with the photographer. She is about to playfully slap him; between these two shots a quite noticeable lady in furs and purple polka dot dress is walking from left to right in the first one, right to left in second. (00:20:55)
Continuity mistake: After the cage fight, Chick Gandil gives Speed the money putting it in his right hand. Next shot and Coburn pulls back...his left hand. (00:53:40)
Continuity mistake: In the opening interview with the trucker, the wide shots with him leaning against the grill show just a few thin hair out of position. In the close-ups he sports much messier hair with large curl out of place in the middle of the forehead. (00:00:50)
Continuity mistake: As the animated film opens, Charlie Brown's mailbox has a small red flag that is attached to the rear of the mailbox with the flag facing up. At the end of the film, the flag is attached near the front of the box and it is facing down.
Revealing mistake: When the protagonist jumps two of the evil cowboys that are after his jewels, the stuntman on the right tosses aside the rifle in a quick deliberate move pretending to lose it. (00:10:25)