With Curtain Call, for paying repeat, do I have to play the repeat costs in order?

No, you do not have to pay the repeat costs in a specific order.

According to Rule 820.3, if a spell has multiple instances of Repeat (like Curtain Call, which allows you to pay three different options), each instance can be paid for separately.

Because you declare all intentions to pay for Repeat costs as you play the card (during the "Pay Costs" step), you simply declare which of the available Repeat costs you are choosing to pay. You are paying for the additional executions of the spell's effect, and the game does not impose an order on which "Repeat" cost is paid first—you simply pay the total combined cost of all the ones you choose.