- Fridge Brilliance / Foreshadowing: The paternity of Callisto's child: as a son, the person who got her pregnant couldn't be any of the three goddesses. Basic genetics means that it had to be someone with a Y chromosome.
- Harsher in Hindsight: Upon first seeing Adonis, Melpomene says, Hes too beautiful to live. By the end of the volume, he has been killed.
- Hilarious in Hindsight: In the chapter "Twisted Fates", Apollo begs Hephaestus and Aglaea not to tell people he and Thalia are sharing a room while convalescing, "or gossip will give us seven kids by the end of the week." By the end of A Snag in the Tapestry, they have claimed the septuplet Corybantes as their own to keep Calliope from facing Hera's wrath.
- Ho Yay: Athena, with Thalia. Athena and Artemis are a canon Will They or Won't They? pairing.
- Spoilers: They Do
- Moral Event Horizon: If Zeus's rape of Calliope doesn't count, then pretty much everything he does in Snarled Threads probably does.
- They Wasted a Perfectly Good Character: Despite the story centered around the Thalia and Apollo, only Calliope is the only other Muse to have any storyline and notable character development.
YMMV / Thalia's Musings