The cloth on the back of Curly's pants disappears when he heads back to the shack after the bear traps subdue the bad guys.
The shot when Curly peers out of the stove and sees Red and his henchman is repeated, again.
The yelling of the bad guys after they get caught in the bear traps is not heard anymore when Red and his assistant go into the shack.
Wet spots can be seen on Moe's shirt when he hands the sheriff the bottle, even though he has not been sprayed by it, yet.
During the short, you can see a bandage on the back of Curly's neck.
A wire can be seen pulling the sheriff's wig off.
When the bad guys realize they have been robbed of their gold, they head out the back door after the Stooges. Just before their feet get caught in the bear traps, they start to pull their guns out.
When Curly runs past them towards the shack to retrieve the gold the men suddenly don't have their guns anymore..
Curly can be heard yelling along with the bad guys when the traps set them, for some reason.