While Suzy is talking to the animals in the plane's cargo hatch, we can see Johnny playing with some circus props in the background.
The combo seen here (riding a unicycle while joggling stuff and playing the harmonica) is the same one he used in the episode Under the Big Flop from Season One, when he joined the circus.
This is the second Johnny Bravo Christmas episode. This is also the second Johnny Bravo half-hour long episode.
When Johnny was talking about how the last time he was in the cargo hatch of a plane he was bound and gagged and forced to join the French Foreign Legion he was referring to events that happened in the episode Over the Hump, back in the first season.
Although Santa punches Johnny as soon as he sees him, he also mentions that he doesn't remember the incident from "last year" when Johnny accidentally beat him up thinking he was a burglar. Santa only punched Johnny because he thought he deserved it.
Pilot: (to Donny after singing) You are conceded.
Santa: trying to remember his name) Um--you're uh…
Donny: I'm a little bit rock n roll.
Johnny: (to trucker) Are you sure that's you talking and you didn't swallow some beautiful babe?
Johnny Bravo: Wanna see my abs?
Johnny Bravo: So are you cookin' beans inside there?
Johnny Bravo: Hello fire department. I just called to let you know that I'm a bomb, and I'm about to blow up! Cancel that. It's too late.
Johnny: (singing) Oh Christmas gifts, oh Christmas gifts! The ones you get for free!
Johnny: (to Suzy in a mocking voice) Johnny Johnny, I'm so happy, I'm a girl, nah nah nah, nah!
Animation Studios: Saerom Animation.
Santa's P.O. Box Number
Johnny's letter to Santa gives Santa's P.O. box number as 1225. 12/25 (December 25) is the date of Christmas.
Suzy (To Johnny): I just Bugs Bunny'd you!
Suzy's line about "Bugs Bunny-ing" Johnny comes from the 1950 animated short Rabbit Fire directed by Chuck Jones and "staring" Bugs Bunny, Daffy Duck and Elmer Fudd.
The process of "Bugs Bunny-ing" someone is using reverse psychology, into making your target admit something he was denying all the time.
When Johnny and Suzy come out of the luggage inside the airplane, they come out dressed up as Fred Jones and Velma Dinkley, famous characters from the Scooby-Doo series.