2-1: Easy clock skip if you time your shot well, you get a 1 sec window to get it though
2-5: If you hit the first clock, then immediately go up, you can cross the bridge in time!
2-8: You could have trimmed some time if you did not flinch!
2-9: ditto
3-3: MASSIVE time loss
3-9 Might have been able to abuse a jump pad to not grab any crystals here