Throughout the bullfight, the bulls horns change from being white with black tips to all-black.
Before the Stooges enter Shamus O'Brien's office, Curly twists the crease of his hat brim to the back, but when they enter the office, the brim crease is at the hat's front.
When Curly runs away from Jose in the bedroom, he trips over the blanket on the floor and almost falls over.
Obvious stunt double for Curly when he and Larry crash through the office's glass door.
When Curly hides in Dolores' bed, the right sleeve of his jacket is pulled up, making it easier for Jose to pluck the hairs on Curly's arms.
The band director at the bullfight is waving his baton faster than what the speed of the music is playing.