In the first loop, Nadia was in an active position to save Alan if she had helped him when he was drunk; Alan was in a passive position to save her just by being someone to occupy her time and not be out getting hit by the car. (Had he been sober I’m not sure how he would have crossed her path.) But that’s just the physical way; they also both saved each other existentially within the loops. I took the final scene as the two separate timelines merged with the Loop versions meeting up again. The fact it was in the middle of some random midnight parade was a little strange. (Also, the homeless guy’s timeline made no sense to me if I tried to follow it. For a long time I thought there was more to him than met the eye.)
Nadia’s four loops that ended with her falling down the stairs trying to leave the party made me laugh; did we ever find out what happened to poor Alan in those loops? He couldn’t have gotten very far.
This also reminded me of Happy Death Day, which is a good thing as I really like that movie.
Loved the series though; not sure what a season 2 would entail, but I would like to see more.