When Sheriff McCool and Joe Reno are camping out, it is patently obvious that their campfire is unreal. The reflected light is like a strobe, that flashes every few seconds like clockwork.
When Angel is playing the guitar, his fingering doesn't match the chord changes or strumming.
When Tab Hunter is handcuffing Yvonne De Carlo in the wagon for the first time he has his gun in his holster which would make it easy for any of the prisoners to grab. This would never be allowed on a prisoner transfer wagon.