The Pepe's Lagoon song is sung a total of 6 times, while "Arg" is said 7 times.
Why does Tuesday's hair turn blue during scenes (like when she gives Truman the glue and when she sets in the toilets)? Also, why does Truman's hair grow back overnight?
Mrs. X: Fight, fight, FIGHT!
Mrs. X: Do you wanna get eaten by bears?!
Mrs. X: I should call your mothers.
Glowface: Ahhh, stop her before she calls my mom!
Glowface: Pepe's lagoon, Pepe's lagoon goon goon! Arr!
(Glowface takes the manual out of Mr. X's pocket)
Mr. X (gasps): The Manual!
Glowface: Look, I'm rubbing my butt on the Manual! (Runs to X Jet) I'm writing "Wash Me" on your precious X Jet!
Mrs. X: Good suggestion!
Glowface: I'm sending you my annoying "Joke of the Day" E-mail!
Mrs. X: I hope it's a knock-knock joke.
We learn that going to Pepe's Lagoon once a year is a tradition for the X's.
Truman rides the X-Jet all by himself in this episode.
"To Err is Truman" - At the end of the episode, Tuesday is the one who goes to mime camp.
Rex X makes his second appearance.
Sunny D Truman's quote, "I hope dad didn't drink all the purple stuff," is a reference to an old Sunny Delight commercial.
To Err is Human, title is a pun of this common phrase.
Tuesday: Truman! Come out to plaaay!
This is very similar to a famous line from the 1979 movie The Warriors. That line was, "Warriors! Come out to plaaay!" Repeated several times.