For some reason, if I add multiple videos from a playslit to another playlist, it adds them backwards. 1-2-3-4-5 becomes 5-4-3-2-1 in the new playlist if I select all 5 of them and choose to add them all at the same time. Also, be CAREFUL when removing videos in a 100+ videos playlist, it seems the app also select other videos by itself and you could remove them by mistake.

Edit: I know it ain't bothersome when it's only 5 videos, you can manually set the order; but it is bothersome when you add 100+ videos at a time.