1) Brionac's cost needs to enter the graveyard.
2) Catastor will not trigger while attacking a face down monster or it itself being face-down.
3) Colossal Figher's effect is optional.
4) Gigantic Cephalotus only triggers when Plants are sent from FIELD to grave.
5) Jade Knight's effect of 1200 atk and below machines not being destroyed by trap cards only triggers when it is in face-up attack position.
6) Morphtronic Accelerator can only return Morphtronic MONSTERS.
7) Indomitable Gladiator Beast can return any Gladiator Beast CARD, instead of being only monster.
Earthbound God Aslla Piscu only destroys face-up monsters.
And uh, they make Core Chmair Powerhand's effect clearer for less confusion.
Basically nothing much errata'd.