At the beginning of the movie, when the main character is cutting his ear off, we can clearly see the half of it. (at around 63 mins) when the ear unfolds from the bandage we see a whole piece of it.
When all the personalities are seen following Chi-Wai in the warehouse, the dolly track can be seen reflected in a mirror behind Chi-Wai as he moves out of frame.
The reflection of the camera is seen disguised under a black cloth in the reflection of the mirrors when all the personalities are walking behind Chi-Wai at the end of the film.