The inability to filter explicit songs out is maddening! And it's a glaring omission to anyone with young children. I have seen it skip from a My Little Pony song to an explicit Patton Oswalt standup bit (perhaps because he voiced a character once... I have no clue) while my daughter was listening.

Another annoying one is how you can choose an exact song to play on tablet or on PS4, but not from your phone - you can only shuffle play there. Try explaining that to a 5 year old.