I also notice that often when i grab the star medal and get a cam to the pins, sometimes it stays there even in the menu and doesnt go away. One time it went away when i grabbed another star medal but ost of the time stays there all the time.
Also, i suggest that you should add a button to reset the whole course from zero. It would be more comfortable that have to go to the main menu and go all the way to the level i was playing.
I just finished the demo too and i also want to say that im very excited about the whole game, u never miss. Congrats.