- Accidental Innuendo: As Lilo and Stitch hunt down the experiment of the episode "Richter":
Lilo: Let's get him sticky!
- Alternative Character Interpretation: Is Gantu's Villain Decay due to lazy writing, or being fired from the Council in the original movie (and being reduced as servant of a hysterical rodent) made him fall into a depression so deep it directly affects his performances?
- Anvilicious: The strong emphasis on ʻohana (family).
- Ass Pull:
- In "Angel", Lilo only finds out Angel is working for Hämsterviel because of a tag she saw around her neck on the video Pleakley took. Angel never wore the tag any other time.
- The T. rex at the end of "Retro". We never see how Retro made that. Though it could be assumed that he used his powers on a chicken (the T. rex's closest relative out of all things) or some other type of bird.
- In "Snafu," Angel releases everyone from their capsules by knocking her head against the glass. Apparently, super-strong experiments can't break those capsules without The Power of Love. That, and Angel never showed signs of having super strength in her debut (which is not entirely the writers' fault considering what happened behind-the-scenes, but still).
- Base-Breaking Character: Mertle Edmonds; is she amusing or annoying?
- Contested Sequel: Although this show has plenty of fans who enjoyed watching the antics of Lilo and Stitch as well as his "cousins", it does have enough detractors who don't like the way it was handled, especially with the writing being much weaker in comparison to the original film. In some cases, those detractors treat Lilo & Stitch: The Series and its pilot and finale films as Fanon Discontinuity. Either way, this show did start the franchise's Broken Base, years before the Stitch! anime and Stitch & Ai fractured it. There have been many arguments on the Internet over whether The Series is any good, making this show a rather divisive one among Disney's animated television series.
- Designated Heroes: Lilo and Stitch (especially Lilo) come across as this in some episodes, particularly in the ones where they practically give the experiments over to Gantu and Hämsterviel usually because the experiments annoyed them (such as Nosy, Felix, and Heckler) and/or their abilities were of no real benefit to them (such as Hunkahunka and Poxy). Worse is that these abandonments are often Played for Laughs as said experiments start messing with Gantu afterwards (Felix starts making a mess in Gantu's ship, Poxy makes Gantu ill, et cetera). Nosy actually calls Lilo out on this in "Snafu", and even a few fans argue that she still comes across as a Designated Hero in that episode, too. (Said fans believe that "Snafu" did not properly address her going against her own message of ʻohana enough, that she was too Easily Forgiven by the experiments she previously abandoned after the rescue, and the issue itself was all pushed aside to focus more on Stitch and Angel's reunion.)
- Ear Worm: "Aloha, E Komo Mai", with its fun, feel-good sound.
- Ensemble Darkhorse: Several of them among the experiments, which are covered back on the franchise's YMMV page linked at the top. Angel is probably the biggest one, considering she's one of the few experiments most fans can recall right off the bat and Disney is continuously releasing merchandise featuring her worldwide to this day, despite that she was in only two episodes throughout the entire three-year run of this show and the anime where she is more prominent is disliked by most Westerners (especially Americans).
- Epileptic Trees: When Lilo & Stitch: The Series began rerunning on Disney XD in March 2018 with a mini-marathon on March 11, the mini-marathon aired with "Yapper" as the last episode that day and dedicated fans, especially those on Save Lilo & Stitch, took notice. Why? 'Cause in that episode, Stitch goes crazy for a brief moment when he sees the Honolulu skyline for the first time, since he was made to destroy cities. The fans took this as Disney foreshadowing a possible American broadcast of the franchise's latest TV series Stitch & Ai, where in that series Stitch grows into a giant when his destructive programming is triggered and he goes on a rampage towards a city under construction.
- Evil Is Cool: 627.
- Fanfic Fuel: Since Stitch has over 600 different cousins, it's not hard to write a fanfic featuring one of them.
- Hilarious in Hindsight:
- Pleakley isn't the only flamboyant alien hiding out amongst a family who loves dressing up.
- Also, Jumba and Pleakley aren't the only two intergalactic alien agents who live on Earth in a single house as roommates and help out a child with an important mission that decides the fate of the universe.
- In "Short Stuff", 625 declines helping Gantu because he has "half a Reuben" left to eat.
- Four trailers for the first movie featured Stitch gatecrashing several animated Disney movies. In season two, four episodes have characters from other Disney shows crossing over. Revenge is had, kinda...
- Ho Yay:
- Pleakley. True, it can be given in the beginning his "aptitude" with Earth customs is lacking, but early on... he openly tries girl's clothing. He also seems to crush on Jumba. Ironically, this seems to be a Disney subversion of Hide Your Lesbians.
- Jumba and Pleakley continue to live together in a single house, continue to play husband and wife a lot in private and in public, and they share a bed (to be more fair, they share a bunk bed so they technically sleep in separate beds).
- The Very Special Episode where Pleakley's family try to make him get married—he's very reluctant until the 'bride' is Jumba in a dress, and in the end his family accept that Pleakley's happier without a wife. He also promised to wear men's clothes, which set off Fibber. Meaning he intends to keep wearing women's clothes and never has any intention of ever wearing man's clothes.
- There was also a scene between Jumba and Pleakley where they rip off the airport scene from Casablanca.
- And the relationship between him and Jumba seems to go both ways: Jumba occasionally addresses him as "my little one-eyed one." Awwww.
- Actor Allusion, Actor Allusion, Actor Allusion! Pleakley is voiced by Kevin McDonald, of The Kids in the Hall fame. The man is used to playing characters in dresses. Not only that, but his family members in said episode were voiced by old castmates Bruce McCulloch, Mark McKinney, and Scott Thompson, with Dave Foley playing the priest.
- "Jumba and I have found the secret of love!" Oh, Pleakley.
- Hunkahunka's peck, which causes the target to fall in love with the first person they meet, is decidedly gender-blind, leading to at least three instances in the episode where a male character falls in love with another. Gantu was a constant victim of this as the experiment's pecks caused him to fall in love with Pleakley (who he mistook for a woman because Pleakley was wearing a dress at the time) and Stitch. Pleakley also flirts with five surfer dudes while cross dressing in the same episode, only to get rejected by all of them.
- The relationship between Gantu and Reuben has some Ho Yay in it as they live together in Gantu's crashed spaceship and Reuben often makes some snarky but somewhat silly comments towards Gantu about his looks. They even bicker Like an Old Married Couple due to being Vitriolic Best Buds in The Series.
- Jerkass Woobie: Gantu occasionally gets his moments in episodes like "Dupe" and "Phoon", where he questions his own life and failures. In "Amnesio", when he loses memory, in a Call-Back to the original film, he says "I'm lost."
- Most Annoying Sound:
- Most Wonderful Sound: Angel's singing. Thank you, Tara Strong.
Stitch (to Angel): Eegalagoo!* Ooh, nice pipes!
- No Problem with Licensed Games: The sole tie-in game for the show, Lilo & Stitch 2: Hämsterviel Havoc for Game Boy Advance, is a decently fun action-platform game. Helps that it's based on the also good Lilo & Stitch video game for the same platform that was released in 2002, addressing that game's issues (such as replacing passwords with internal saves) and expanding the gameplay with new features (such as Mode 7 driving levels and having experiments follow Lilo and Stitch around to help out).
- The Scrappy: Keoni Jameson. He's a bland Audience Surrogate who adds nothing to the plot, and Lilo's crush on him tends to bring out the absolute worst in her.note Even the writing staff hated him, since he was mandated by the execs.
- So Okay, It's Average: It's a pretty decent show to watch, as it has plenty of entertaining moments, all those unique experiments, and maintains some of the feel-good charm of the original film. However, Disney's Executive Meddling, the 65-episode limit, and their overmilking the franchise for what it's worth during the 2000s decade made the show's writing weak and formulaic (causing it to become badly Lighter and Softer with all those aesops), squandered much of the experiments' potential since the production staff had to stick to the Monster of the Week trope so much, and caused the core cast to be significantly flanderized. In fact, some fans prefer the otherwise-controversial Stitch! anime and Stitch & Ai over The Series because of how it was handled.
- Sweet Dreams Fuel: On the one hand, this show can make one feel nostalgic about their childhood, going on fun adventures with your best friend, making and helping out strange new friends along the way...
- Tastes Like Diabetes: ...on the other hand, the saccharine and childish elements of this show can be somewhat overbearing for older audiences, especially when compared to the rather dramatic original film and its surprisingly mature tone. Granted, this isn't as bad as over in Japan, but still.
- Tear Jerker:
Nani: Cobra Bubbles?
- In the Halloween special, we get Spooky who can shapeshift into people's worst fears. For Lilo, he turns into a Monster Clown. For Stitch, he turns into water. For Jumba, he turns into his ex-wife. For Pleakley he turns into his mother. What does he turn into for Nani?
Spooky (as Cobra): I'm here to take Lilo away.
(Nani looks appropriately terrified.)
- Then there's the episode "Remmy", where both Lilo and Nani are depressed throughout the majority of the episode, due to it being the anniversary of their parents' death.
- They Wasted a Perfectly Good Character:
- Victoria, the red-headed girl Lilo befriends. It's obvious the writing team struggled with her then just gave up altogether. A pity, she had a cute design.
- Experiment 627. How can you use such a powerful antagonist as a mere Monster of the Week?! Couldn't he have been more effective as recurrent villain? Or as the Final Boss, instead of a dull red doppelganger of Stitch?
- Really, a lot of the experiments. Some episodes, such as "Spike", showed some potential of how their personalities could be fleshed out if they were given more screen time (like in the E.A.R.W.A.X. scenes in that particular episode), but the Monster of the Week setting combined with the 65-episode limit ruined such hopes, with many experiments relegated to being flat background characters. Even some popular experiments like Angel (624) didn't get that much further characterization in the episodes they appear in. Granted, the Stitch! anime did help to fix this problem, but then again...
- Hämsterviel (who is based on Dr. Habbitrale from the video game Stitch: Experiment 626) and 625/Reuben (from Disney Adventures magazine) are Canon Immigrants without problems. Why 621 (from the aforementioned game) didn't make it? He would've been a Worthy Opponent for Stitch throughout all The Series. Heck, given his thirst for revenge against 626, it could've been him the titular experiment of episode 19 (627's), unleashed by Jumba to give Stitch a lesson about his ego, and, as aforementioned, keeping 627 as recurrent antagonist/Grand Finale's enemy.
- In the Crossover episodes, the guest characters - save for maybe Dr. Drakken - are very bland versions of their original selves. This takes away very much from the plot's premises.note
- They Wasted a Perfectly Good Plot:
- In the episode where Lilo is hypnotized into acting like Mertle, they missed a perfect opportunity to have Mertle say Lilo was acting weird. Instead, one of Mertle's friends points out that Lilo is acting like her and nothing more is said about it.
- Also the episode "Dupe": Gantu finds four unactivated experiment pods and turns them into a Four Man Strike team against Lilo and Stitch. After they are defeated in the climax of the episode, the experiments never show up again, save for the finale, "Snafu", where they are Gantu's prisoners.
- "Rufus": Why didn't Jumba meet Drakken? It would have been interesting! In fact, the entire episode would have been better if they'd exploited Jumba's Card-Carrying Villain attitude toward the Kim Possible cast, instead of just making him chase a poor naked mole rat.
- "Spats": Mr. Cooper's subplot is superfluous, being a one-shot original character in the middle of a crossover between two series' estabilished casts. Not exactly "perfectly good", maybe, but nonetheless it could have been a totally separated episode.
- The whole concept of the show to some people, with the possible expansion of the franchise's universe and its characters being mostly squandered in favor of generic children's Aesops and an overemphasis on kid-friendly humor.
- Viewer Gender Confusion:
- Quite as few people mistook Pleakley for a woman. Which is fairly easy to assume, since he only wears dresses, and disguises himself as a lady in public.
- Yin (501) gets a lot of this as well. An extremely feminine experiment, he/she is often labelled a female by viewers (not to mention several wikis), despite Lilo referring to him/her as a male repeatedly.
- Same goes for Shush (234), who's much less feminine than Yin and was also referred to as male in its episode, yet fan wikis label the experiment as female.
- Villain Decay: Gantu turned from the imposing but somewhat Anti Heroic thirty-something-foot-tall military captain from the original movie into a much shorter bumbling idiot who even proclaims that he "likes to be evil". Subverted at the end of The Series when it doesn't work out for him and gets his old job back.
- What an Idiot!: Houdini is an extremely timid, extremely gun shy experiment with the power to make things disappear. Where does Lilo reckon his "one true place" lies? As a star magician on TV, naturally.
- X Meets Y: Disney meets the Pokémon anime.
YMMV / Lilo & Stitch: The Series
See also the YMMV page for the whole franchise and the original film, and the YMMV pages for the show's pilot and finale films.