After seeing a lot of referee mistakes, I might start liking the idea of playoff. I mean, I feel playoff can make the influence of referee mistakes smaller in the end.
1st to 3rd clubs = straight Champions League
4th to 7th clubs = playoff for Champions League or Europa League.
I used to like Nat Geo's "Air Crash Investigation". The recorded conversation between pilots often help us to understand what was actually happening. I think referees conversation should be recorded too.
I don't think Rematch can happen at all. However, the referee was too awful yesterday. Plus, it was the third apology = PGMOL stole 3 to 9 points from a single team, which is too big loss for the club to aim at playing in Europe next season. Apology is not enough at all.