* BigLippedAlligatorMoment: The sunken treasure Mudge unearths in book 8, while he let the Princesses take some jewelry. He legally was able to keep the rest of the treasure for himself, though said treasure is never mentioned again after that scene.
** Jon-Tom summoning [[spoiler:M'nemaxa]] at the Battle of the Jo-Troom Gate.
** Roseroar is pretty much a walking CMOA, but highlights include how she breaks Mudge and Jon-Tom out of Malderpot's jail and how she eliminates Corroboc.
** Mudge's insult-fest that brings down the cage of insults.
** Talea's rant against Braglob after she is freed from his compulsion.
-->I wouldn't leave now even if you agreed to it. I've been used. I ''feel'' used. I want to make that unseen bastard pay. He almost had me killed, which isn't so bad. But he tried to make you do it. That's dirty. I don't like dirt, Jon-Tom. I like clean. There's something up there that needs cleaning up.
** The final battle in ''Chorus Skating'', in which Jon-Tom's spellsinging isn't powerful enough so [[spoiler: an alien they befriended, (who crossed over from another one of Foster's book series') summons giant black monoliths straight out of "A Space Odyssey 2001" except they're actually giant alien amplifier speakers which are able to tune into his non-electronic Duar. Jon-Tom blows the enemies away with the loudest Rock&Roll ever heard, amazingly without deafening anyone. Even better? Mudge (who never gave a crap about Jon-Tom's music) admits he liked playing the drums when he was younger and accompanies Jon-Tom by dancing on a massive Conga-ish drum]]
* CrowningMomentOfHeartwarming: The entirety of [[spoiler:Mudge and Weegee's relationship]] is this. The moment when Jon-Tom gets to listen to Couvier Coulb's collection of gneechee music, and learns that Beethoven, Jimi Hendrix, Jim Morrison, and Janice Joplin have all continued to create incredible music after death, is both this and quite the TearJerker.
* FridgeBrilliance: Jon-Tom when he first arrives, is outright disgusted by the new world. But as the series progresses the swearing, drugs, and offhand mentions of sex lessen. Because he is slowly accepting it, and realizing it's not as bad as it first seems. Once he fully accepts it, most of the mature stuff is almost completely absent. Showing a better, brighter world. We are seeing the story through his eyes, after all.
** The perambulator at the end of book 5 ended up crossing into our world. It would make sense if traveling between worlds, it left a tear in space and time. A tear that opened a path between worlds? Maybe situated inside a cave?
* FridgeLogic: It's been stated several times, that otter tails are short and stubby. As opposed to the long trailing ones from our world. This makes sense, seeing as they walk upright--it would be a pain to have that huge thing dragging along behind you wherever you go, slowing you down or tripping other people. So evolution was in play, seeming to have shortened it. (If they were ever long in that world.) In that case it would also be true with other animals with similar tails, though Snooth the Kangaroo's tail is never brought up, nor the tails of other similar creatures like Wallabies.
* TearJerker: Mudge's emotional breakdown when he thinks Jon-Tom is going away for good. Especially the fact he for the most part seemed to hate Jon-Tom's guts throughout the first four books, and many times wouldn't think twice about just abandoning him.
-->[[spoiler: A large furry mass struck him square in the chest. He staggered backward with Mudge clinging to him. The otter was sobbing uncontrollably. "You ain't comin' back!" Black nose and whiskers were inches from his face and tears were pouring down fuzzy cheeks. "I know you ain't, once you get back to your own world through that bloody 'ole in the ground you'll be back in familiar surroundin', back among your own kind, an' you'll forget all about us. About poor ol' Mudge, an' Weegee, and that senile 'ardshell Clothahump who needs you to look after 'im in 'is old age, and even about Talea. You'll get back to where everythin's comfortable and safe an' relaxin' an' you won't be comin' back 'ere.'' He grabbed the vee of Jon-Tom's indigo shirt and shook him.]]
* ThisIsYourPremiseOnDrugs: Think Narnia on an unholy combination of pot and Viagra.
* UglyCute: Baby Weavers in ''Hour of the Gate''. Despite being a pack of ''poisonous spiders'', they're as open and curious as any children, and quickly develop affection for Jon-Tom and the party.
* WhatDoYouMeanItsNotForKids: The premise sounds cute until you realize the books are full of graphic violence, foul language, drug use, and references to furry sex. Though bizarrely, despite that, there is still deep down a strange innocence to it that cannot be explained through words.
** Folly. Not only is she an orphan who has lived her whole life in slavery to Corroboc and his pirates, but she just continually gets put through hardship after hardship--getting mugged, getting taken to [[OrphanageOfFear the Friends of the Street]], getting kidnapped and ensorcelled by [[spoiler:Jalwar/Zancresta]], and finally sent to kill herself in a lava tube. [[RescueRomance Her persistence in pursuing Jon-Tom]] aside, one can hope she was finally able to make a good life for herself after they returned with her to the Bellwoods (or [[WhatHappenedToTheMouse wherever she went]]).
** [[CryForTheDevil To some degree]], so is Braglob, the BigBad from book five. Which is why [[HopeSpot the moment when his cowardice and insanity are cured, and he and Jon-Tom seem to connect briefly while he expresses his gratitude, is so heartwarming]]. Until [[AnimalStereotypes his typical wolverine nature]] asserts itself, of course.
** StoicWoobie: Cautious, once it's revealed he lost his family in a storm.