The style of the hammer Shemp has changes when Moe hits him on the head with it.
When Larry and Shemp are pulling tacks out of Moe's behind, you can see the visible padding in his pants.
Larry's lines "Stupid old buzzard!" and "Fix a bed." are clearly dubbed in.
When Moe says the line "Ready, aim, fire!". It is clear that he is saying something else.