The actors who play "Johnny", "Scotty" and "Robyn" all loved to imitate the voice of Slurp (performed by Victor Yerrid), so the writers added a line of dialogue here when Johnny imitates Slurp saying "He's not wrong."
Sid and Marty Krofft, two of the executive producers and creators, make cameos as the two customers who refuse to buy lemonade from Robyn in episode 107.