Eugene Irwin: Now let me get this straight. You mean there is violence here?
Doc: Yes sir.
Eugene Irwin: In a prison packed with violent criminals? Hmm.
The inmates build the wall using mortar to strenghen it. In the following scenes after the wall has been knocked down, there isn't mortar attached to any of the rocks.
The Last Castle was filmed in Nashville Tennessee from March through June of 2001 at an old abandoned prison facility in the northern portion of Nashville.