Clean sheets aren't something you tick manually. As soon as you record a result where the opposition scored nothing, Dugout automatically applies a clean sheet to every player who appeared in that match, so there's nothing extra to remember when you're entering stats.
Man of the Match. You can also record one Man of the Match (MOTM) for each fixture. The award is limited to a single pick per match and enforced automatically, so there's no risk of accidentally choosing two players in one game.