Some clarifications that may or may not be too obscure to include in the rules:
If you use Prince or Ghost to play Crown at the start of your turn, you’re in your Action phase at that point.
Any extra turns are resolved after Donate/Mountain Pass.
Enchantress 1: The play ability is not actually changed on the Action card; rather the player gets +1 Card and +1 Action instead of resolving it. So they can call Royal Carriage to replay the Action and this time resolve its play ability. Similarly, Ghost will resolve the card’s play ability the second time it plays it. If the played card is a Duration, Ghost/Royal Carriage stays in play.
Enchantress 2: If you play Enchantress several times, the other players still only get +1 Card and +1 Action: Only the first Enchantress replaces what the players do; Enchantresses after that make no difference.
Enchantress 3: If one of your opponents gets an extra turn, the first Action played on that turn will also be Enchanted. (The rulebook says "just on their next turn", which is normally true, but not in this case.)
Enchantress 4: Timing - If a player plays an Enchanted Attack card, Reactions and Urchin will trigger first, as normal.