When Curly says the line "Oh, jumping beans!". Moe can be heard starting to laugh off-screen.
When Moe and Larry enter the room where Curly is soaking his feet, there is a wisp of smoke in the air with no obvious source.
When Moe lands on the chair with the clickers, you can see him put them on the seat of his pants.
When Curly and Mrs. Bullion tumble over the chair after Moe kicks Curly in the behind, Emory Parnell, playing her husband, almost bursts out in laughter.
You can see a bandage on Curly's leg throughout the film.
Curly is heard groaning when he and Larry are scrubbing the floor of the exam room, but we do not hear why he did.
When Curly says the line "Think we'll have to blast." You can see that Emory Parnell is losing his grip with the piece of cement in his mouth and it moves to the mouth's edge, so there would be no reason to blast it out.