Amethyst: The Gem Behind the Slaughter/Tropes

*"Mister Sandman" Sequence: The opening credits hit you with as many late-80s signifiers as possible (the film is set in 1987). It's even set to "We Built This City" by Starship, one of the most 80s songs in existence.
*Approval of God: Rebecca Sugar, creator of Steven Universe, loved the movie.
*Nothing but Hits: The soundtrack is full of this.