There's been some pretty blatant references that formed the back-bone of a lot of the shows; like Anatomy Park and Jurassic Park, Lawnmower Dog and Lawnmower Man (which also references an unrealised pitch that Justin Roiland made prior to Rick and Morty,) the Vindicators and the Avengers. Then there are the films that Rick straight out says they're copying like Inception, The Purge and Saw. Don't get me wrong I think R+M is one of the best animated series to come out in a long time, even beating things like Archer and Venture Bros (both of which I love,) but if you don't notice all the pop-culture references in there you're probably missing out on half of the jokes.