During the 1940s and into the early 1950s, Coffin appeared in other movie serials, including Dick Tracy's G-Men (1939), Jesse James Rides Again (1947), Bruce Gentry (1949), Pirates of the High Seas (1950), Mysterious Dr. Satan (1940), Sky Raiders (1941), Holt of the Secret Service (1941), Perils of Nyoka (1942), Federal Agents vs. the Underworld (1949), and Radar Patrol vs. Spy King (1950).

[3] In 1955, he joined Peter Graves, William Schallert, and Tyler McVey in the episode "The Man Who Tore Down the Wall" of NBC's Hallmark Hall of Fame.

On February 9, 1960, Coffin appeared as Grey Gordon in "The 10 percent Blues" of the ABC/WB crime drama Bourbon Street Beat with Andrew Duggan, Richard Long, and Van Williams.

In an episode of Climax!, an adaptation of Raymond Chandler's The Long Goodbye, Coffin, playing a dead body, is said to have arisen during its live broadcast and walked off stage.

He also appeared in comedies, including episodes of The Beverly Hillbillies,Father Knows Best, Hey, Jeannie!, I Love Lucy, Batman, and Walter Brennan's The Real McCoys, and in the second season of The Abbott and Costello Show.