The rabbit costume that Ed wears in "One of a Kind" is the same rabbit costume Brandy wears in "Believe in the Bunny" to disguise herself as the Easter Bunny.
Jerry: So I said yeah, and then Garu said no way, and I said, yes way then he said cool, and I said tight tight.
(When Brandy kicked Whiskers out of the tree house)
Tiffany: That was a little mean.
Brandy: Oh, it was more than a little.
(Brandy and Tiffany both start laughing)
(When Mr. Whiskers told Brandy his Easter theory)
Brandy: I think I remember Easter being about something else.
Mr. Whiskers: Hey, you remember it your way and I'll remember it mine!
Tiffany: I'm Tiffany Turlington of the Texas Turlingtons.
Tiffany: (gasps upon seeing Mr. Whiskers) Intelligent life form!
(Various jungle creatures then come out of hiding and begin laughing.)
Ed: (about "Bunny Pal" robot) It's awful loud!
Mr. Whiskers: Yes, I am proud!
The credits for this episode were leaked six weeks earlier then this episode aired. The credits were accidentally put with "Bad Hare Day / Paw and Order". They were fixed after the first air.