First mention of Jimmy Buffett in Episode 04. All three brothers are already familiar with several of his songs, and seem to have an appreciation for them (at least, as good songs to have sex to).
Griffin called Jimmy Buffett a "shitty shitty artist" during Justin's Jimmy Buffett vs. Kenny Chesney in Episode 196.
Griffin excommunicated Justin from the McElroy brotherhood over his Buffett-heavy Spotify history in Episode 220.
Justin wondered publicly if James would "witness him" in Episode 362.
Justin discussed his birthday experience at Margaritaville & Hamilton with James and Lin in Episode 380.
Appears in Episode 400, where he meets up with the brothers and is asked by the three what he thinks is the scariest sea creature.
A brief clip of Jimmy appears in Candlenights 2023, in which he kindly admonishes Sydnee's parents Tommy and Mary Smirl for taking her to one of his shows when she was 4 years old.
To sadly no longer be continued. Rest in peace you beautiful wave creature.