Continuity mistake: At one point, the gigantic title character knocks over a city bus. For a moment, the word TONKA can be seen on the underside of the vehicle.
Continuity mistake: At the start of the film when Tom is doing his trial run, he is forced off the road to avoid crashing into two oncoming trucks, driven by Johnny and Red. His truck has the number thirteen number board on the front, which isn't on it during any other time during the trial run, although it's on the truck for the rest of the film.
Continuity mistake: In the scene where Glen Ford shoots the stagecoach driver dead, the body falls to the ground. Glen Ford gives the order to put the "dead" man on the saddle of a horse. When the men lift him up, the "dead" man puts his right hand up onto the shoulder of one of the men.