The TV Tropes page on the film ( http://tvtropes.org/---/ReadyPlayerOne2018 ) mentions some of the adaptations that had to made due to legal compications; I just hope this doesn't apply to some of my favorite shout-outs!
I watched the teaser...and forced myself to not watch the trailer so I could kind of be surprised. And yes...I'm SURE there were legal complications. BTW, I was pretty proud of myself...in the book, I guessed part of one clue...I figured he was referring to Cap'n Crunch! I seem to remember that they spelled it wrong (Captain). I could be wrong, but I can't find it in the book now. Just a useless fact I felt the need to share LOL
Think it'll be a great movie but a lot different from the book. Have a hunch that the film won't have time and energy to build up the feeling of the Oasis-society in the same scale as the book does. Fingers crossed that it will be a good movie!
Update: saw this one yesterday - in 3D yet, something I don't usually bother with. (It isn't essential to enjoying the movie, but it was used better here than in many films.) The adaptation did mess with some stuff from the book, including removing one of my favorite bits (though there was some graffiti homage on the heroes' van), but I liked some of the changes and could accept the rest. And I had fun playing spot-the-references against the friend I saw it with; I won on all the "The Shining" bits (that was hilarious, btw) and he won big on recognizing the magic phrase that activated the orb.