Visible crew/equipment: In the last scene where the main character escapes, he jumps into the bay and is supported by a sack which he is carrying. Actually you can clearly see that he is supported from underneath by a diver.
Continuity mistake: When Papillon is getting shaved by Maturette, the amount of foam on his face changes between shots.
Continuity mistake: When the inmates are trying to catch the butterflies, Papi is seen with his chest exposed, no tattoo on his chest. In the following scenes the butterfly tattoo is there.