After a person fails a level, they can press a button to view the replay. Only this time, the replay will start 10 seconds before the user failed the map, instead of the beginning.
To be honest, I think players would like this. I mean, having to watch the entire replay (on double speed) just to see what you did wrong in the end has always annoyed me, and I feel like checking what you did wrong is the only reason usually the reason why people would watch their failed replays anyway.