Going in range from youngest to oldest after being changed by the fountain of youth water, Numbuh 3 was youngest, followed by Numbuh 1, Numbuh 2, Numbuh 4, and Numbuh 5.
In some parts of this episode, Lenny's helmet was completely red with no white stripe.
Numbuh 4: Get a load of all this chow!
Numbuh 5: This must be the cafeteria. (to Numbuh 1) Nobody touches anything!
Numbuh 1: (whispering to Numbuh 4) Numbuh 5 says, don't touch anything.
Numbuh 4: (whispering to Numbuh 3) Numbuh 1 says, don't punch a thing.
Numbuh 3: (loudly to Numbuh 2) Numbuh 4 says try the onion rings.
Numbuh 2 (helping himself) Well, you don't have to tell me twice. (Numbuh 3 screams) What?! I was going to share. Huh? (The KND see a milky booby trap go off)
Numbuh 1: Uh, is anyone here allergic to milk?
Numbuh 5: No, but Numbuh 5 is allergic to drowning. Let's go! (The KND run away)
DCFDTL: Lunk, you stay here to deter any uninvited guests. (Leave via the secret passagway)
Lunk: (Moans, then takes a liking to Leona's bracelet) Duh, purty!
Numbuh 5 (kicks open the stall door, knocking Lunk out): Five uninvited guests coming right up! (activates her communicator to contact the other KND)
Toddler Numbuh 5: This mission is over. Let's go guys.
Toddler Numbuh 2: (Giggles) I just did!
Numbuh 4: Okay, run this by me again. Why are we risking our lives to save Leaky Leona?!
Numbuh 5: Because the last time Numbuh 5 didn't help someone kidnapped by the delightful children they did something she can't ever forgive!
Numbuh 4: What?! What did they do that was so bad?
Numbuh 1: They made me bald.
Numbuh 4: Haven't you dorks wasted enough of my day without yammering on about nothing? I think it's time I check you into the Atomic Headlock Hotel!
DCFDTL: Splendid. Could you help us with our luggage? (Open a suitcase which transforms into a giant robot demolition machine)
Numbuh 4: Eeeep!
DCFDTL: Mmmmm! This place looks like it could use some.....REDECORATING!!! (The KND scatter as they begin their attack)
Numbuh 4: Help! Help! I can't swim! Ah! Do you hear me! I can't swim!
Numbuh 5: Well you better learn fast!
Leona (After getting grabbed by Lunk in the bathroom): Hey! You're not allowed in here. This is the girls' bathroom.
DCFDTL: Yes, Leona, it is. And we trust you know why we're here.
Leona: Oh, well, um... I suppose you have to go, right. Hey, um, how do you guys, like do that, anyway?
(The team flees a tidal wave of milk)
Numbuh 2: I don't want to milk the situation, but..
Numbuh 5: Aw, shut up!
Numbuh 5: Give the kid a couple 'a dodge balls and suddenly he's a hero!
Numbuh 5: Hey Delightful Dorks! Over here!
Delightful Children From Down The Lane: Oh goody! We get to play TAG!!
DCFDTL: Have a nice trip Abigail? Any last words?
Numbuh 5: Actually, yeah, I'd like to say...
Numbuh 2: No, no, no, no! Let me say it! See you next fall! (The pillars collapse and the DCFDTL scream)
Numbuh 5: Numbuh 5 wasn't gonna say that!
Numbuh 2: It's a good thing I showed up then, huh?
Numbuh 3: This place is "Gihugic"!
Numbuh 5: This must be the library.
Numbuh 4: What's a library?
In this episode, it's learned Numbuh 1 originally had brown hair, but an incident with the DCFDTL caused him to be permanently bald. Numbuh 5 blamed herself for this happening as a result of not there to help him when he needed it. From that time on, she's devoted herself to helping kids no matter what.
We learn when Numbuh 4 was younger, he looked similar to his little brother Joey
Based on the episode, Numbuh 4 does well in Gym, considering he managed to get them past the Gym part of the ancient school
Second time the KND's and DCFDTL's age was changed. The first time was in G.R.O.W.U.P
Team episode, but more centered around Numbuh 5.
The dodgeball game in the old school gym, was like the giant chess game in "Harry Potter and the Sorcerer´s Stone."
We now know that Numbuh 2 and Numbuh 3 are in the same class and because of Operation: R.O.B.B.E.R.S. that Numbuh 4 and Numbuh 5 are also in class together.
We finally see Lenny of the DCFDTL without his helmet on.
The DCFDTL actually saved the KND in this episode.
We learn that Leeky Leona uses the Fountain of Youth to stay a kid forever, even though she is really old.
We learn that Numbuh 3 wore her hair in pigtails until she was 9.
F.O.U.N.T.A.I.N. stands for Figure Out Unusual Nerd's Tantilizing And Impossible Necessity.
This is the fourth full-length episode of the series.
Leona: You... have to find the fountain...
This is a reference to the game Golden Sun, likely. There's a point quite late on when you find a man who's lived to be over 150. He tells you he's lived off magical draught, and is almost dead from a recent lack of it. You are then sent to get it, in a similar way that Leona said that line.
Fountain Of Youth Secret Passage: Harry Potter
There is a secret passage in the girl's bathroom activated by turning a knob on the sink. It's probably a reference to Harry Potter And The Chamber Of Secrets.