Continuity mistake: When Clyde starts eating his meal from Del Friscos, his left hand is handcuffed to the bed. It is not handcuffed when he is able to get up and stab his roommate.
Suggested correction: Prisons don't leave inmates cuffed to their beds in their cells. He was cuffed for everyone else's safety when Nick, the warden and the others were in the cell trying to found out the location of Bill Reynolds. Once everyone left the cell, he would have been released from the cuffs.