Let me go through the video and comment on that.
0:30 - 8thy's movement would only be a bug if having her start in Crono's bed was a permanent plan. The game moves Crono, but ignores 8thy, since it expected one party member. This causes the walk glitch shown here.
0:56 - 8thy has "unique" sprites, but it's a copy of Crono's. Not a bug, just work to be done.
1:30 - Not sure what happened there.
1:33 - More of the party not properly grouped glitch.
2:00 - Missing sprite assembly here. Simple to address.
2:09 - See above.
2:38 - See above.
2:42 - Proper tech learning goals had not been set for 8thy. She learns up to 3 until the Spekkio flag gets set.
3:00 - The incomplete graphics set has some filler Magus sprites. This is one place that calls them.
3:12 - Never split the party... unless you properly regroup afterwards.
3:49 - Tech data is a work in progress for 8thy. Some things have a started expansion, others are incomplete.
Notes from what I have organized:
- MP Growth needs to be moved.
- In locations after 0x20, objects need to be relocated. The 8thy lag glitch is because PCs need to be ahead of NPCs in object order. After moving 8thy's object, any commands that address specific object numbers need to be adjusted as well.
- Techs techs techs.
- Optimally, Gaspar should be moved to the background of the exchange screen.
- The End of Time will need to be split, with at least one character on the other part (probably Magus).