Replaying on a new save file: go straight to Tek after the robot boss. He's not there, but you can press the computer and part of the cutscene will start again.
May as well round up what else I've found:
- All Allies skills like Hot Box Heal are almost impossible to use in the menu. Single-ally skills work.
- Minor object clippings, such as the phone at Dups' lab in Cunch
- Music and SFX can entirely disappear in battle or when entering a location. I have no idea how to trigger it - it seems to work 100% when you enter the dungeon with the dragon at the castle. It's possible to reenable music and SFX when exiting and re-entering the game, but the opposite can happen too
- What's the A button for if it doesn't appear anywhere but after the three slimes fight in the abandoned town?
- Ancient Horn can be used in battle, but does pretty much nothing.
- Text can go out of bounds in textboxes (watch the ones with all caps) and particularly the status screen.
While said issues are minor, not having them makes games better to play ^^