I think for one mistake to change the entire game it would have to be something like a red card early in the game. I, of course, mean a game where there is a clear favorite and a clear outsider. All mistakes that are “less” do not have much meaning because if the favorite missed a goal (by accident) but could not come back, then for me this means that it simply was not stronger in this particular game.
I think that in the final Real will not take risks by holding the score 1-0, for example, I expect a lot of goals and a confident victory. The examples of the Conference League and Europa League should be a good lesson for all the favorites.
If you have been watching Dortmund games in the UEFA champions league this season you wouldn't want to assume them not to be an equal side with real madrid this season. I don't see real madrid as favourite, football fans are judging the game based on real madrid past records in the competition to that of Dortmund but it's seems this season has a different twist of reality for all of the team's we have had in mind to be the favourite in all the two European finals competition's. Bayern Leverkusen was said to be the favourite, Atlanta won it, Florentina was said to be the favourite too but then Olympiakos won it in a superb way.
Here's to R.Madrid vs Dortmund, can the twist of fate continue?