In close up, the that poster the Stooges hang upside-down is reversed as well.
When the Champ is seen spinning the fake cow, Curly and the referee are seen ducking their heads, but in the next shot, they are standing up.
When Curly gets thrown over the fence, the first time, you can see a hand throwing the stunt dummy.
When Curly coughs up the feathers from the pot holder, you can see more feathers from a previous take.
When Curly is looking at the poster, he accidentally backs up and bumps into Moe behind him.
When the referee declares Curly is disqualified, he is seen looking the wrong way.
When Curly is shown hanging on the telephone pole with his suspenders, he is not shown wearing his coat, but there is no scene featured where he had to get out of it.
When Curly kicks paint into Moe's face, his yelling can be heard twice.