When Captain Whitfield is hallucinating in the mess tent, Col. Potter tells a curious Igor that she's having "d.t.'s" which means Delirium Tremens. Hallucinating is one of the symptoms of coming off of heavy drinking.
The $3.19 that Major Houlihan (Loretta Swit) owes Captain Whitfield (Gail Strickland) would be the equivalent of about $36.00 in the year 2023.
When Margaret and Helen are talking, the picture on the wall behind them is Brad and Janet's wedding from Rocky Horror Picture Show.
At the end when BJ realizes that there are photos of him naked circulating in camp, Charles says, "My, isn't he the testy one," which is a pun on the word teste.