Don't get me wrong, I definitely enjoy this movie and I appreciate its innovative style - but! I have never felt 100% comfortable with the alternate scenario thing.
Which scenario is the "real" one?
It feels pretty strange that Lola can just decide to restart from her phone call with Manni everytime things get screwed up, and it's hard to put your finger on what exactly is going on there.
I guess that since this movie is supposed to show "what could've been" it makes sense to think of the first scenario as the "real" one - but the third scenario is clearly much happier, so I like to think of that one as the real ending.
Or are all scenarios equally real, but take place in parallel universes or something?