When Sgt Hacker and his men try to get information out of Gomer, Gomer responds with nothing but his name, rank and serial number, as set forth in the 1929 Geneva Convention: "Gomer Pyle, PFC, 2252594."
Mabel Albertson had a recurring role as Howard Sprague's mother on The Andy Griffith Show (1960), from which this show was spun-off.
Tom Lowell also played a 'Nelson' character in 31 episodes of Combat! (1962) As Private Billy Nelson, U.S. Army.