Anecdotes

The prison yard sequence was shot at M-G-M, using the set originally built for "The Big House" (1930).

This movie was referenced in Targets(1969) in which Karloff played a thin veiled version of himself.

Boris Karloff had previously played the role of Galloway in a stage production.

Movie debut of Constance Cummings.

The only non-Caucasian prisoner in the 2500-man prison is Japanese Tetsu Komai.