Cartman's ventriloquist impression of Jennifer Lopez directly resembles Richard Libertini's performance as General Garcia in "The In-Laws" (1979), especially the "Ah! Si, si, si!", "It's nice", and "He very handsome."
The ending scene where "Jennifer Lopez" removes her wig to reveal her true identity (to a shocked crowd) as a man named Mitch Conner is an allusion to the ending of "Tootsie" when Dorothy Michaels removes her wig to reveal her true identity (to a shocked crowd) as a man named Michael Dorsey.