Josh Strait (the Ruby Cook) has his first speaking role in this episode despite being in the show since the first episode, "Ruby Reborn". His character is not given a name (Josh) until the next episode, "Hair Loss".
When Hank goes to buy Coke and Pop Rocks from Brent, and Brent replies asking if his stomach will explode, this is actually based on the urban legend about Pop Rocks and Coke, which was tested by Mythbusters' Adam and Jamie. The test was busted, therefore Brent asking Hank "won't that make your stomach explode?" was referencing the still current rumors about the urban legend, despite being busted by the Mythbusters.