At the end, Bender uses a magnet to hold the orphans' picture to the inside of his door. In the pilot, we learn that magnets cause Bender to break out in folk songs.
The pillow case patch on the bed that Fry is seated on while playing cards changes.
Leela's prosthetic eye moves with her real eye. Since the doctor used a marker for the pupil it should essentially always remain stationary.