Continuity mistake: A group of new recruits is introduced to horseriding. One spindly volunteer gallops off first, but when we see him from behind he has been replaced by a stuntman of about twice his width.
Visible crew/equipment: During the movie whenever Bob Hope is pulled off the wagon by his team of horses you can see a board leaning against the wagon that was used to help the stunt man when he was pulled off the wagon.
Continuity mistake: When Yosemite Sam enters the saloon, there are swinging doors behind him. When he orders "all of you skunks" to "clear outta here", the other cowboys leave but the doors to the saloon have disappeared.