There's a bit of a glitch with some of the trade verifications - I was on Route A and had just gotten the Quarter, checked with the arcade desk, and was offered the opportunity to trade my tickets in for Disguise Glasses - which kept my sprite in disguise for the rest of the game, even though the item didn't shortcircuit the store key trade because it was displaced by the capsule toy. It did think I'd 100%ed the game though, even though I hadn't even started Route B yet.
On Route B, the balloon-for-tickets trade also seems a bit broken, because it was also offered before I had a balloon. Everything else seems to have worked, though.
What was up with the stinger? Someone walked out of one of the locked studios, in the TV network building wherein TVs seem to be leaking strange goop due to alien signals, and just went downstairs? Are we ever going to get an answer for what was going on there?
Finally, my favorite moment was the one random NPC girl who is also on a house-that-Jack-built fetchquest, thus making it clear that JRPG fetchquest shenanigans are just how things work in this universe.