Revealing mistake: When Hettie drives her motorbike up to the café for the first time, you can see the horse and cart in the background zoom across the frame - because of the film being sped up at that moment.
Revealing mistake: When Barry stands at his uncle's dinner table to supposedly "toast" Captain John Quinn for his pending marriage, to Barry's cousin Nora Brady (who Barry is in love with), he throws his glass in Captain Quinn's face instead. However, the glass noticeably breaks before Barry even throws it.
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)
Revealing mistake: Establishing shots of the party where Chaney will fight Pettibon's guy; when we see the band play and people dance, the footage is rather obviously stopped and reversed to give the impression of a longer shot (evidently they had too little usable film of the crowd dancing). (00:31:00)
Revealing mistake: When the motorbike randomly explodes after Terri and Dave get out of the car, it is obvious that the explosion does not come from the bike, but from the shrub behind it, which also happened to creep up closer between shots. (00:07:30)