Trixie and Veronica are not seen morphing into their costumes.
This is the only Halloween special of the series.
Transformers - The Jack-O-Bots name is a play on the "Autobots", although the Jack-O-Bots themselves are evil while the Autobots are good. (This makes them more similar to the Autobots' enemies, The Decepticons)
Toys Я Us - Vicky's insult, "Where did you get the stupid European costumes, Dorks R Us?" contains a play on the chain's name.
When Veronica, Trixie, and the other rich kids appear on Timmy's doorstep, Veronica's pupils are mistakenly colored pink. After Trixie tells her to polish her costume, Veronica's pupils return to their normal blue.
When Cosmo and Wanda initially appear as cats during the scene where Timmy meets with Mark Chang, Wanda is colored green and Cosmo is pink. In the next shot, their colors swap back to normal.
Although the Jack-O-Bot costumes are wished back into normal, inanimate objects, they later appear on Unwish Island as sentient beings.
When the Pumpkinator prepares for detonation after morphing into its' doomsday device shape, it begins audibly counting down the final minute in a bored tone ("59, 58, 57...") But when Timmy starts speaking, it remains silent for the rest of the countdown.
When Cosmo and Wanda sit on the green monster, they’re going backwards instead of forward.
Although this episode aired on October 29, 2002 in the United States, it was actually produced in 2001 according to the credits. It was also the final episode to be made in 2001.
Mr. Turner: (puts on a Mrs. Turner costume) I'm going as your mom!
Mrs. Turner: (puts on a Mr. Turner costume) And I'm going as your dad!
Cosmo: You can't spell 'Halloween' without 'ow' in the middle. (eats lollipop and breaks his teeth) Ow!
Mark Chang:: Vicky! My beloved, 'tis I, Mark, your rocking princely love from-
Erik: [referring to her candy bag and Timmy's arm holding onto it] Look out, dude, she's armed!
[swats bag out of her hand causing it to fly into the air and have candy fall]
Jeff: Ah! The sky, it rains death!
King Gripullon: [watching Vicky and kids trick or treat] Wait, wait. [gasps] You were right, my queen. It is a conspiracy. The Earthlings are arming themselves for war with the substance most lethal to we Yugopotamians... candy! Defense demands a royal response of an even higher order. I shall... [pulls a level that causes a metal spear to appear, which opens up to reveal a piece of paper and a pen] write an angry letter! [vigorously writes a letter, which is shown to be a "Q"] Somebody mail this.
Timmy:: Reflective tape?
Principal Waxelplax:: That's right! I'm reflective, you're reflective! This year, I'm giving away safety! [As she says this, Chester whispers to A.J and pulls out a roll of toilet paper] And if you TP my house, I'll hold all of you back a year.
Chester:: I'm being held back a year anyway. [cheers and runs off]
Mark:: Come, Vicky, let us board my princely pod and blow this rock! [uses remote to open the door and lower ramp]
Cosmo:: [runs up] Ah, ah, ah! Hold it right there! I'm afraid I can't let you gentlemen leave just yet. [pulls out clipboard] I'm here to inspect your vehicle, but first it's time for my break. [throws clipboard and pulls out a pillow, falls asleep on ramp]
Timmy: He's gonna blow! Wanda, help!
Wanda: But I'm not a fairy anymore! Without my fairy powers, I'm as useless as that tooth! Wait a minute. If you become whatever you're wearing, that's it! (takes Cosmo's pillow) Sweetie, wake up! (climbs up and puts pillow on the giant tooth, Bender appears)
Dr. Bender: Holy molar! I'm gonna have to give this kid more than a quarter! (struggles to pull the tooth and falls backwards, losing his wand and crown)
Wanda:(catches both) Let me hold that for you. And that. If you become whatever costume you're wearing, [changes back into a fairy] Yes! Make a wish! Make any wish!
Timmy: I don't want everything real and scary! I want Halloween the way it's supposed to be! Fake and safe! (Wanda grants the wish and everything returns to normal)
Cosmo: Yay! I'm a fairy again! Uh, 5 more minutes (snores)