Hawkeye's line "so round, so firm, so fully packed" was part of a slogan for Lucky Strike cigarettes in the 30s & 40s. Coincidentally, Lucky Strikes were produced by American Tobacco Company, which sponsored "Your Hit Parade" (1950) (a radio and television program from 1935-1959), also the title of the previous episode. Additionally, this line (in full) was used in the Warner brothers cartoon Book Revue (1946) starring Daffy Duck, a cohort of Bugs Bunny's, whose signature line was used for this show's title.
Potter remarks of one of Klinger's alleged "children" that he must be at least 19, meaning Klinger would've had to have fathered him at age 11. That means that Klinger is believed to be close to 30 years old at the time of the episode - relatively old for a non-medical enlisted draftee. Jamie Farr was about 44 years old at the time of this episode's filming - incredibly old for an enlisted draftee.
The title is from Bugs Bunny's famous opening line.