Contrary to the park's kids' statement that pancreas is not a vital organ, it in fact is and one of the most important ones: its malfunction leads to diabetes.
Final episode crediting Vonnie Batson who retires after this episode. Batson had been working in animation since 1966 working for Don Bluth, Simba Enterprises, Hanna Barbera, Disney Television Animation, Cornell Abhood Productions, Fred Calvert Productions, Animation Camera Services, Filmfair, and Stephen Boustow Productions.
While this episode is included on the Season 5 DVD and is considered apart of that season, several sources, such as Netflix, consider this episode and Nega-Timmy a part of Season 4.
Adding to the confusion, these were the only episodes in the season besides You Doo and Just Desserts! that were produced in 2003, the same year most of Season 4 was in production.
Timmy's wish is similar to the one had in the first episode The Big Problem, but instead of becoming fully older, he just wished had a body of a teenager.
"Norwegia", the "country" Timmy mentioned to where Gah came from, is actually the Latin and Polish names for Norway.
The difference here is the the Latin name is actually spelt with a "v" instead of a "w" (i.e. Norvegia), and the Polish name is the same as the first spelling, but with the "w" being pronounced with a "v" by Polish language standards.
Bugs Bunny - When Elvis Presley says "Did somebody knock?". It is a reference to the Looney Tunes episode "Rabbit Fire" wherein Bugs Bunny says the same words after coming out from the hole.
When Mr. Turner lands his car in Adrenaland, it's parked in the center of the amusement park. At the end of the episode, the car's parked in the parking lot.
Cosmo and Wanda turn Timmy into sixteen year old Gah in the middle of the park earlier with no problem, but when he wants to be wished back, Cosmo and Wanda say they can't use their magic because they're in public. This may be because there was nobody around/paying attention to Timmy earlier, though.
Timmy was still able to wish away his Gah-look even though Vicky fell in love with him.
Characters saying "that's the password" and dropping somebody down a trapdoor.
When Gah saying "help" while Vicky thinks it means "I love you" in Norwegian.