~1:56 - I'm guessing from your reaction to that ball that you don't use reverse very often, and that's definitely a spot where you need to back up rather than do a full 180. (actually later on I see you use reverse, maybe it was just this one ball you didn't react well to)
3:20 - I think on the balance, that's a spot where he almost always touches the ball and moves it some way that your premature jump will put you out of position to react.
3:43 - ignore the ball and go get the boost to the left, you'll still probably be in position to make a play when you turn right again - when out of boost, always be thinking about how you can get more, and that was a good opportunity
3:56 - nice