Insane Admiral: The Army Colonel gives his men real ammunition for the drill with the intent of actually killing Homer and the others he finds to worthless to be soldier's. He declares martial law on Springfield to find them and rounds up any man who even vaguely fits Homer's description
Insistent Terminology: When the fat/bald people are rounded up, Superintendent Chalmers complains that he's just balding.
Chalmers: Does anybody appreciate the "ding"?
Skinner: I appreciate the "ding", sir.
Mandatory Line: Lisa doesn't have a major role in this episode because she's at a PETA protest.
Oh Crap: Bart and Milhouse when the bullies no longer have to refrain from picking on them.
Recycled Script: Family Guy did this same plot just one week earlier, which Stewie and Brian joining the Army trying to get Chris out.
Series Continuity Error: One of the biggest. In one scene, Lenny is talking to a soldier and is half-crushed by a tank. It then cuts to inside Moe's Tavern, where Lenny is seen fine and unscathed.
Take That: Basically, this episode says that "Springfield is the dumbest city in America and even they're too smart for the Army".