Continuity mistake: When Elmer is putting oil on the robot after it gets covered in rust, the arrow on the dial is pointing to the right. In the next shot, it is now pointing to the left, and in the shot after that, it is pointing to the right again.
Continuity mistake: When the robot is searching for Bugs near the shed, you can see there is a metal basin near the door. But when Bugs (dressed as a female robot) says "Yoo-hoo, Mr Robot!", the basin has gone.