The bars on the shoulders of Stan's campus boss change from 1 stripe on the right shoulder and 2 on the left shoulder, to 2 on the right shoulder and 1 on the left.
The control sticks in the helicopter do not move in sync. For flight safety reasons control sticks in aircraft are mechanically connected so both pilots agree on the input.
In one scene, the color of Josh's shirt, and the color of the walls behind him, suddenly change.