The amount of water on the floor after Mr. Morse steps in the bucket.
The white ladder allowing The Stooges to exit the rocket ship just magically appears once they open the lower door to exit back outside.
While he boys are climbing into the ship after fueling, you can hear Moe say "help me c'mon I'm caught help me". His lips dont move because this is a sound bite Moe says when the boys are being forced into the giant bird cage.
In the rocket ship, wires can be seen lifting Larry as he feels the effects of gravity.
When the boys are transported to the room, you can see their tape marks on the floor.