Ok. Here's a few more non-5e things:

6. Imps don't have resistance in the prologue or use sting or turn invisible or change shape.
7. You can pick up enemies and throw them at other enemies more than 10 feet away and deal more damage to both than if you used a weapon.
8. Invoke Duplicity only grants advantage to a cleric if the cleric is within like a 10 foot radius of it. Looks nothing like the cleric and it isn't a minion that can be moved via Bonus action.
9. Scrolls can be cast by ANYONE.
10. No checks to see if you can cast a spell via a scroll if it is a higher level spell.
11. No Medicine checks to stabilize characters.
12. You restore 1 HP to a character by using the Help button if they are dying.