Lt. Rollins: Oh, come on now, Corporal! Isn't this obviously a case of "res ipsa loquitur"?note "The thing speaks for itself" — not actually an argument that Klinger directly store the camera as per the charge, but instead that Klinger's direct negligence led to the theft, and that absent that negligence, the camera would not have been stolen.
Miscarriage of Justice: Narrowly averted. It's mentioned that the Army is making a big show of cracking down on all the thefts in the area, hoping that Klinger will lead them to bigger figures in the underworld. It winds up being a near Kangaroo Court, as everyone outside the 4077th assumes Klinger is guilty over circumstantial evidence.
The Perry Mason Method: Although it's not the "lawyer" who is able to do this. Hawkeye and BJ find the actual thief and are able to haul him into the court-martial literally seconds before the tribunal was going to find Klinger guilty.
Playing Drunk: Hawkeye and BJ pretend to be drunk while talking loudly about a Charles's tape recorder to bait the real thief into making a move on it.
Hawkeye: I think we've made an important medical discovery. If you fake being drunk long enough, you get a real hangover.