While changing for an operation, BJ talks about his affections for Aggie and Hawkeye mentions that BJ has been down this road before. This is a reference to BJ's affair in Hanky Panky (1977).
When Aggie O'Shea impresses B.J. with her sports knowledge, he refers to her as a regular "Red Barber". Walter Lanier " Red" Barber was a play-by-play announcer who, at the time of the Korean War, was calling the games for the Brooklyn Dodgers. His colorful commentary included such phrases as "sitting in the cat-bird seat", an expression Aggie uses which means " in good standing".
Aggie refers to Bill Mauldin , famous for his "Willie and Joe" cartoon series of World War Two.
BJ refers to "the little old (General) from Pasadena"...the original saying is "the little old lady from Pasadena" a folklore that began after WWII, when widows would inherit powerful large automobiles from deceased husbands that would rarely be driven (because women had a rough time driving large cars like Buick Roadmasters and Lincolns), hence the phrase "it was previously owned by a little old lady from Pasadena".
The concept of BJ's undying fidelity would carry more weight if he hadn't already cheated on his wife in season 5 episode 18 - "Hanky Panky".