JayElle,
CONTAINS SPOILERS ABOUT THE PLAY'S STRUCTURE
I think the clue in the dialogue that the scene was starting over with the same characters is that the opening dialogue was always the same. What would happen if...
It was like a very ridiculous, absurdist choose your own adventure. If the couple forgot the wine in the car and the Cooper's call got through this is what happened, etc. Being set during a meteor shower added a magical, mystical element that allowed for time to keep being repeated until they got it "right." Each time the scene started again it was basically a blank slate, but it was like some remnants of the past iteration stayed in the hosts' minds and they were finally able to thwart all the evil fvckery that was being thrown their way; the tables were turned and the awful couple got everything that was coming to them.
Marie: Don't be in such a hurry about that pretty little chippy in Frisco.
Tony: Eh, she's a no chip!