The movie is a loose adaptation of the novel by Ernest Cline of the same name. Even though Spielberg has tried to put a lot of effort he did miss a hell lot of cool references as well. Moreover, he ended up adding more Easter eggs in the movie which is good for a regular movie goer. The movie didn't do justice to the protagonists and their stories but rather maneuvered the movie in a very subtle style.(Plethora of details omitted from the Novel).

So, to all the geeks out there who still haven't watched the movie, don't get your hopes high, not one of the best Spielberg movies and READ THE NOVEL. 100% fun guaranteed provided you know your pop culture well ;)