While certain Marvel Cinematic Universe movies served to set up future MCU flicks (Avengers: Age of Ultron and Iron Man 2, for example), Guardians of the Galaxy: Vol. 2 was nearly free of connections with other movies set in this shared universe. Of course, there were hints of connections here and there. In contrast with Iron Man 2, James Gunn had free rein, and was able to further develop his characters from 2014's first installment.
Scenes that did reference other movies or set up future MCU installments weren't at all intrusive, as they fit almost organically into the film. Just compare the infamous Avengers: Age of Ultron scene in which Thor had his vision with Nebula's revealing backstory about Thanos.
So what were these references with which Guardians of the Galaxy: Vol. 2 set up future MCU movies? Well, check it out, but only if you've seen the movie!