In two episodes radar has comic books that could not have existed. The first one is when Col Flagg breaks his arm and sneaks into Frank's file. Radar is pretending to sleep with an AVENGERS comic on his chest. the Avengers were not published until the sixties. The second is the episode where Hawkeye is up for court martial for mutiny. Frank is searching Radar's desk and pulls out an AVENGERS comic and a SPIDERMAN comic. Both were not published until the sixties