I am not a lawyer either, but I seriously doubt Quentin Tarantino gets permission from every rights holder for every verbal pop culture reference he makes. Or the author of Ready Player One. Or any book or movie that references real world events, products, or media. A character saying he googled something or tweeted, or checked Facebook or ate at McDonalds - these are ubiquitous presences in everyday life.
Now using a lot of pop culture references may be a bad idea for other reasons - it dates your work (you never see 80s sitcom Murphy Brown in syndication for example, because it’s a time capsule of 80s pop culture.) And you run the risk of substituting pop culture references for actual jokes/humor.