The role of Eddie, the reformed arsonist, was played by Jack Riley, a primarily comedic actor who from 1972-78 had a recurring role as Elliott Carlin on The Bob Newhart Show (1972). Riley would return as a different character in the second season episode The Madonna Legacy (1975).
Jack Riley's character, identified as Eddie Stern in the on-screen credits, is called Eddie Stark by both Harry and Lt. Trench.