The tough little mouse wearing a T-shirt featured in The Hunk at the End of this Cartoon is Bigelow, a rather obscure Hanna-Barbera animated character, who while never starred in his own television series, had a couple of guest-appearances on shows like Augie Doggie and Doggie Daddy, Yakky Doodle, Snagglepuss and even the theatrically released Loopy de Loop cartoons.
Johnny: A hunk of cheese! I get it! (starts laughing) Hey, wait a minute, that isn't funny.
The song Bunny is singing in the car, "Lunchlady Suprise", is also the name of the movie Johnny was supposed to star in, during the events from the episode Johnny Goes Hollywood.
The episode The Hunk At The End Of This Cartoon is a parody of the Sesame Street book The Monster at the End of This Book (1971), in which the character of Grover, misled by the book's title, tries to prevent the readers from reaching the end of the book.