At the start of the episode, when Dell reverts back from the creature, he's unkempt, but wearing shoes.
Goof: During the fight between the two Hulks it is obvious that a stuntman is standing in for Lou Feringo when the bad Hulk throws him against the computer console.
Dell Frye: (to Jack McGee) No, but I know that man that you're talking about... I can lead you to him.
Jack McGee: (to Dell) You're John Doe. You're the man who becomes the creature.
Brad: Well, what do you think?
Dell: I think you'd better leave me alone, Brad.
Dell Frye: I'm not looking for trouble.
David: You might not have to.
Dell: I'll take the risk. But you'd better not do anything against me... because you know when I get mad, what I can do.
Carl Decker: (to Brad) You give me trouble, I'll bust you just like I did Case and Willie.
Brad: (After Dell Frye throws beer at his face) Crippled or not, you shouldn't have done that.
(Dell Frye has just gotten punched by Brad Wheeler)
Dell: After all these years, I thought you were tough. I hope that wasn't your best shot.
Brad: It wasn't.
(Jack McGee notices that Elizabeth has two cups on the table)
McGee: Tea for two. Company coming?
Elizabeth: My habits are none of your business.
(Jack McGee arrives at Dell's apartment, thinking Dell is "John Doe")
McGee: I'm looking for Dell Frye.
Dell: That's me. What do you want?
McGee: I was expecting a younger man, dark brown hair.
David's only transformation in this episode is different. Usually, you'll hear the "Hulk aura" begin as soon as David's eyes turn green to begin his metamorphasis. But this time, there's a lengthy delay after his eyes turn green.
alias: David Barr
Dell Frye, the name of Dr. Clive's assistant, is a reference to actor Dwight Frye, who played Dr. Frankenstein's assistant Fritz in Frankenstein (1931).
The deceased scientist Dr. Jeffrey Clive is a reference to movie actor Colin Clive, who played Dr. Frankenstein in the Frankenstein movies from the 1930s.
The town Vissaria is also the name of the village in the Frankenstein movies (though spelled with only one "s").