!!From the movie/musical
* Right before the speech on "The Man", Freddy says this line so casually and the way its forgotten about immediately after tops it off. [[CreepyChild Freddy's even drawing a picture of a fire when it's happening.]]
-->'''Dewey:''' Freddy, what do you like to do?
-->'''Freddy:''' I dunno...burn stuff.
* The parents' shocked and awed faces right after two of the children sing, "Kick some ass!" It's like, "I can't believe they just sung that."
* After learning that Dewey's class has gone to the Battle of the Bands: ''in a congratulatory voice'' "I've just been informed that all of your children are missing!"
* Dewey's '''very''' unfortunate word choice:
-->'''Dewey''': I have been touched by your kids, and I'm pretty sure I've touched them. (Horrified, disgusted looks on the parents faces. Cut to Dewey running out of the class in a hurry.)
* "I read about groupies. They're [[PrecisionFStrike sluts]], they sleep with the band!"
** Dewie trying to offer a better comparison by calling them "cheerleaders," [[NotHelpingYourCase disgusting Summer even further]].
** The ''very'' disgruntled face she's making as she waits for Dewey's van to pull up.
* The kids feigning the terminal illness "Stick-it-to-da-man-ni-osis". That is all.
* "You are a fat loser and you have body odour!"
** On the DVDCommentary, all of the child actors literally beg Robert Tsai to say the line for them (he doesn't comply).
* Billy continuing to snipe at Dewey even after he declared the trash-talking session over.
-->'''Billy:''' You're tacky and I hate you.
-->'''Dewey:''' All right, you see me after class!
** "Dont be talking about my bow tie!"
* "Math is a wonderful thing, Math is a really cool thing. So get off your ath, let's do some math! Math, math, math, math, maaath!"
* Spider, the replacement guitarist in Dewey's old band, trying to pick up Ms. Mullins.
* One of the outfits Billy makes for the band and Dewey's reaction. Punctuated by the extremely annoyed expressions on Katy and (especially) Freddie's faces while they're modeling it.
* The look on Summer's face when Dewey unleashes a sudden BigWhat in response to some bad news about Freddy. The flash of terror in her eyes is ''way'' too convincing to have been scripted.
* When Ms Mullins is disciplining a little girl, said girl starts to cry and Ms Mullins says (in the same stern voice) [[MoodWhiplash "Would you like a hug?"]] -- and it's ''this'' which prompts the girl to swear she'll be good from now on.
** Even funnier is when Ms Mullins reaches out her arms to hug her, she steps away and ''screams'' like she's about to be murdered.
* Like in the movie, one of the girls in the musical adaptation sings "Memory" from Cats. Dewey stops her, saying that the song's from his ''least'' favorite composer.[[note]]Andrew-Lloyd Webber composed the songs for Cats and the musical adaption of School of Rock.[[/note]]
** After saying this, Dewey says that "I never want to hear that song in this building again". The theatres showing School of Rock on both Broadway and West End have had Cats play in them in the past.
* When Dewey is convincing a tipsy Ms Mullins to let his class go on a field trip to a classical music concert (which is really the Battle of the Bands), some of the "classical" artists he says that the children will be listening to are Beethoven, Mozart...''[[TheLastOfTheseIsNotLikeTheOthers and]] Music/{{Enya}}''.
* After having to endure further verbal abuse from the parents, who are understandably upset at her for allowing Dewie to pose as their children's teacher, Miss Mullins excuses herself, walks down the hall and makes herself stand in the corner.

!!Meta
* Alex Brightman (the original Broadway Dewey)'s vlogs for Broadway.com, ''[[JustForPun Hard Rock Life]]'', have their fair share of funny backstage antics. [[https://www.youtube.com/watch?v=YPl_1K60BAs Episode 2]], in particular, features recurring player (and former vlogger herself) Sierra Boggess in her natural habitat...listening to Music/BarbraStreisand.
** He answers a Twitter question in part 3 from one Creator/LinManuelMiranda.
-->He seems like a really nice guy. [[{{Understatement}} Seems like he tweets a lot.]]