Funny that everyone here mentions Tarantino and no one mentions Hitchcock, for which we are given very obvious Easter eggs. The hotel clerk blatantly suggests Norman Bates in Psycho, Rear Window is reflected in the hotel set up, etc. etc. etc. I guess you have to be older to get this.
Fun movie, most reviewers are right about the ending and Hemsworth's somewhat intrusive Once upon a Time Easter egg, but I don't expect realism in a movie like this. Was Glass Onion realistic?