(at around 4 mins) When Tom finishes the sandwich, his eyes are white instead of yellow.
The construction device that is pounding the big wooden pole in the ground is suddenly much larger when Tom passes thru it.
The flagpole is first shown mounted in the upper right corner of the building but later is shown mounted in the upper left corner of the building.
When Jerry is running clockwise on the flagpole it is loosening from the building. It should be tightening. Right is tight, left is loose.
As Jerry runs on the ball end of the flagpole and it starts to loosen, the threads on the flagpole are longer than the actual flagpole ball on the end.