I wonder who will decided the soundtrack for movie 3, the soundtrack was always decided by Gunn and even Rubberband Man in Avengers was chosen by him. Considering some people haven't realised it's not actually 80's music (it's music Starlord's Mum listened to growing up and passing onto him) and serious suggestions of All Star to be included it's could be the most easily overlooked mistake they could make.
It's not a big thing but I remember watching Iron Man 3 and felt it was missing the AC/DC songs from the previous films.