* AuthorsSavingThrow: Due to some FridgeHorror at how someone like Angelica could have turned out as an adult (RonTheDeathEater paints her ''Rugrats'' self as a complete sociopath), ''All Grown Up'' shows that she mellowed out a lot as she got older.
* BadassDecay: In ''{{WesterAnimation/Rugrats}}'', Tommy and his plastic screwdriver can save the day (albeit mostly in an ImagineSpot). Here, just say RealityEnsues.
* BigLippedAlligatorMoment: In "TP+KF", there is a montage of Chuckie asking other people to trick-or-treat with him after his falling out with Tommy. One of the people he asks happens to be a mouse that can talk. Absolutely nothing was said or done to clue the audience in on the mouse being able to speak and it isn't brought up ever again.
* BLAMEpisode: "Tommy Foolery" mainly for the GainaxEnding that aliens apparently are real in this universe.
* ContestedSequel: Some fans disliked the show for its massive differences, considering several characters got massive personality changes from toddler to preteen. However there are plenty of fans that enjoyed this and ''Rugrats'' - and there is still fan art/fanfiction being created based on ''All Grown Up''.
* CrazyAwesome: Dil, of course! Believes the world is shaped like a tetrahedron, can communicate with porpoises, walks backwards on his hands because he thinks it's a superior mode of locomotion - to name a few. He's also highly intelligent and creative - coming up with unique products to sell at school, and one episode implying he partied with aliens.
* DesignatedMonkey: Tommy becomes this in his preteen years, whenever his friends make him the scapegoat of their fury, whenever they're in a tight situation. This is done episodes like "Truth or Consequences", "Dude, Where's My Horse?", "All Broke Up", and "Brothers Grimm".
* DieForOurShip: Nicole, Rachel, Z and Nicholas for being the love interests of Chuckie, Tommy, Kimi and Lil, respectively. Strangely, a lot of them (save for Rachel) end up getting PutOnABus, particularly noticeable with Z, who doesn't appear much save for a couple of non-speaking cameos at the start of Season 2.
* EarWorm: ''All grown up! I really wanna shout it out!''
* EnsembleDarkhorse: Z is quite popular for someone who appeared only in Season 1, made a brief appearance in Season 2 and then got dropped.
* EpilepticTrees: People were trying to figure out if Savannah Shane and Samantha Shane were one and the same girl (they do [[OneSteveLimit share a last name,]] after all,) despite looking and acting completely different. It doesn't help that Klasky-Csupo confirmed this rumour, right before {{Retcon}}ning it by having both characters appear in the same episode.
* {{Fanon}}: Savannah and Samantha are relatives. The most common consensus is twins though them being half-siblings or cousins isn't unknown.
* FanPreferredCouple: Kimi and Tommy (half of the images of them on [=DeviantArt=] are them getting married). Which is why many people consider TP+KF that TheyWastedAPerfectlyGoodPlot.
* HilariousInHindsight:
** In the episode, "You-Gotta-Go", there is a character named The Shark who makes a brief appearance. [[YuGiOhZexal Come a few years later though...]] To top it all off, said character has purple hair.
** Tommy Pickles is shown to have a passion for filmmaking, [[Film/TheRoom just like another certain Tommy]].
* HoYay:
** When Phil dresses up as Lil, Tommy remarks "Phil looks good as a girl". [[EvenTheGuysWantHim The rest of the guys agree]].
** Chuckie and Tommy share several significant moments together. The scene where Chuckie helps Tommy absail in "Fear of Falling" is full of it.
** Susie and Angelica also have some AwLookTheyReallyDoLoveEachOther moments, often playing out like they're a SlapSlapKiss couple.
** Angelica's desire to suck up to Savannah can make it seem like there's more than friendship on her mind.
* LauncherOfAThousandShips:
** Tommy pretty much bounces between shipping himself off with either Lil or Kimi. In universe, it starts with a girl Chuckie has a crush on, then he has a couple more single-episode girlfriends, then Rachel for a season and then an episode teasing Kimi.
** Kimi is also often shipped with Phil in the fandom. And of course Tommy and Z, both of which get ShipTease in the cartoon.
* MoralEventHorizon: In-universe in "Lucky 13". Savannah deliberately plans another party on the day of Angelica's, knowing everyone will come to hers instead, just as a KickTheDog moment. Despite how bratty Angelica can be, the gang think even she doesn't deserve that.
* NightmareFuel: The video at the end of "Interview With A Campfire", as well as the scene in the tunnels. Especially because said video is a ShoutOut to ''Film/TheRing''.
* RescuedFromTheScrappyHeap:
** Dil was viewed as the most annoying character on ''Rugrats'', due to being TheLoad who couldn't talk and essentially had no personality. Here in the spin-off he's given the personality of a CrazyAwesome CloudCuckooLander who usually gets the best lines. He's one of the favourite characters of ''All Grown Up''.
** Kimi isn't necessarily hated on ''Rugrats'', but her arrival on the show is associated with SeasonalRot. Here she's far more popular, and one of the biggest targets for shipping.
* TheScrappy: Savannah. She's basically Angelica without any redeeming qualities and always does everything she can to make Angelica miserable.
* SoOkayItsAverage: The general opinion of the show. Most would agree that ''Rugrats'' is the better show of the two, with this show having a more lukewarm reception.
* {{Squick}}:
** The kids' reaction to Lou Pickle's Haggis.
** Everyone's reaction to Phil's science experiment.
* StrangledByTheRedString: Non-romantic example. Susie and Kimi are suddenly best friends, and Susie was a surrogate big sister for her, when they barely interacted in the parent series.
* TearJerker:
** From the second episode where Lil moves out of her and Phil's room into one of her own. Just the moment where Phil walks into the room to find her stuff gone and sadly looks at pictures of them together as kids, ending with a shot of them in the mud from ''Rugrats''.
** Tommy's fate in "All Broke Up." Rachel thinks he's been cheating and calls things off with him, the potential new girlfriend gets furious and thinks she's been set up, and of course Tommy's friends are furious that he lied to them.
** In one episode, Susie gets conned out of a thousand dollars by a woman who told her that she would make her a star. When she tells Alisa (her sister), the latter frets about it and Susie assures her that she'll pay her back. Alisa's response is pretty sobering, especially considering that it's TruthInTelevision.
-->'''Alisa:''' (''[[AngerBornOfWorry understandably angry]]'') The money!? Susie, a ''lot'' worse could have happened to you than losing a thousand dollars! You go around with a woman you don't even know, say yes to whatever she tells you to do...she could have taken it [[AdultFear a lot farther]] than she did! ''THINK ABOUT IT!''
* TheProblemWithLicensedGames: It may surprise a few that the series actually did get a couple of video games, one PC game based on the pilot, and one GameBoyAdvance title which was a dress-up game starring the girls. Neither was remarkable, and both fell off the radar as quickly as they came.
* TheyChangedItNowItSucks: Your mileage may vary on whether or not some of the more drastic Season 2 redesigns were a good thing.
* TheyWastedAPerfectlyGoodCharacter:
** Stu and Drew. In ''Rugrats'', they were [[EnsembleDarkhorse fan favorites]], and their bickering were a great source of comedy on the show. In ''WesternAnimation/AllGrownUp'', they fell OutOfFocus as characters, only to reappear together in one episode bickering like before (making it seem like a return to the good old days)...and then the show ended.
** Also, Samantha. Promoted as a possible love interest for Chuckie in the pilot, only to vanish from the show proper.
* TheyWastedAPerfectlyGoodPlot:
** "TP+KF" suggested it might finally have Tommy and Kimi become a couple, but is instead an episode where Chuckie believes Tommy is hitting on his sister and Tommy is trying to make it up to him.
** A lot of think the show itself could have been an interesting concept where the babies have an older, but still immature, view of the world and still having adventures, {{Imagine Spot}}s, and their old personalities (mostly Tommy). Something along the lines of ''WesternAnimation/HeyArnold'' or ''WesternAnimation/KidsNextDoor'', when we really get a slice of life like ''WesternAnimation/AsToldByGinger''.
** The filmmaking contest episode shows home movies from earlier in the characters' lives - after events that happened in ''Rugrats'' and before this show. None of them are ever really touched on, aside from Tommy's fear of water stemming from a childhood accident.
* ToyShip: Due to the characters being older, there's a lot of potential pairings hinted at:
** Kimi is revealed to have had a crush on Tommy and even carved their initials when she was younger.
** The ValentinesDayEpisode has Tommy dancing with Lil at the HighSchoolDance.
** The same episode has Harold pretending to be Angelica's date to make Sean jealous.
** Lil jokes that she finds Chuckie rebelling "kind of attractive".
* UncannyValley: The character designs may not seem like this at first, but when you notice the little things such as huge heads resting on tiny necks, it makes you wonder how they even turn their heads without falling over.
* UnfortunateImplications: In season 2, [[ButNotTooBlack the Carmichaels' skin tones]] [[http://stopwhitewashing.tumblr.com/post/33660779515/the-whitewashing-of-susie-carmichael were lightened]]. Though it's possible that that was due to the colors overall becoming more pastel[[note]]The white characters look a lot more pasty, for example[[/note]].
* WereStillRelevantDammit: This show is meant to do this for the ''WesternAnimation/{{Rugrats}}'' franchise.
* WhatAnIdiot:
** What in the world made you think throwing a bowling ball through your roof was a ''good'' idea, Tommy?
** Drew and Stu basically say this to each other when they realise that the car they threw off of a cliff originally belonged to [[spoiler: Elvis.]]