Ready Player One is all about Easter eggs, not least of which are Back to the Future Easter eggs, which the movie liberally sprinkles throughout its runtime. The McGuffin in Ready Player One’s plot is an Easter egg itself, a golden one. But while the characters are seeking that Easter egg, audiences find themselves looking for metaphorical Easter eggs scattered all the way through the movie. With the confirmation of a sequel, Ready Player Two, audiences are in for more treats.
https://screenrant.com/ready-player-one-back-to-the-future-easter-eggs/