The machine that turned Courage into a fly gave Di Lung a sixth toe (shown at the beginning of the episode).
The kitchen where Katz makes the jam monster resembles the fox's kitchen from the episode "Cajun Granny Stew."
Katz: (while fighting Eustace; to Muriel) Tell me your secret ingredient or your husband is taffy.
Katz: You see, dear lady and dog, I'm always getting second place in the Nowhere Sweet Stuff Contest. Sad, isn't it?
Muriel: If it's my secret ingredient and my caramel apples you're after, you're out of luck.
Katz: Well, (cracks head) we'll just see about that.
Katz: (at the end of the episode, getting second place) Sad, isn't it?
Muriel: (looks at Courage the fly): Courage, is that you?
Muriel: Look, Eustace! Courage is a fly!
Eustace: Stupid dog fly!
Katz: (to Courage) Eyes bothering you, dear boy? Looks like you're ready to blink.
(Courage the Fly hits the light bulb repeatedly)
Courage: I don't know why I'm doin' this, but I like it.
Eustace: (Stomping outside into the evening sunlight, oblivious to the purple goo) Muriel! Where's my dinner?!?!
Di Lung: A fly? I don't think so. Supposed to be buffalo!
Muriel: Put my face back where it belongs... or (else) it's cold cuts for dinner!
Katz: Oh, you are cheeky!
Eustace: What a guys gotta do to get his dinner... wasn't always this way... no, siree!
Katz: How about a little game of sport before you go bye-bye!
Muriel: My secret ingredient is vinegar! I use it in all of my recipes!
This marks pretty much the only time Eustace comes to the rescue (even though he doesn't realize it until after he gets rid of the jelly monster).
The episode "Courage the Fly" establishes that Nowhere is in the middle of Kansas.
This is the third appearance of Katz.