During the "Pop" video when Justin is singing "All that matters is that you get hyped and we do it to you every time...." and when he says "Come on" while the camera is still on him, his mouth doesn't move. I guess he forgot the words.
Just because the words are in the song and are supposed to be sung by the singer, does not mean that the singer will sing all the words. Haven't you ever seen a music video that the singer doesn't sing all the words. That doesn't mean that they forgot the words!
Justin stops singing that line for a reason. Right when "Come on" is heard, a girl from behind him shows up over his shoulder and mouths that line. (She has curly hair and is wearing a denim jumpsuit that says "NUDE" on the back and is in the next scene with Lance in the white room.) But since this was intentionally done this way, I don't think you could call it a slip up.
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