Continuity mistake: When Sam is strapped into the electric chair, the huge clock on the wall behind him, which is there so that both the prison doctor and the reporters viewing the execution can mark the time of death, reads 7:00. The final scene runs for more than five minutes - after which the clock still reads 7:00.
Continuity mistake: As Sam is marched down the corridor to the electric chair, Raul reaches through the cell bars and begs him to confess. In long shots, Raul's arms are fully extended. But in close-ups, his arms are folded and wrapped around the bars.