Let's run them down.
The original Hocus Pocus has been as spooky season staple for generations. The new sequel, Hocus Pocus 2, is a new story, but it includes plenty of easter eggs for OG fans to enjoy. (Warning: Some spoilers follow.)
One of the earliest callback is Hannah Waddingham’s witch character singing “Garden of Magic,” which was Sarah’s song to lure kids in the first film. Note that it attracts Young Sarah more than Winnie or Mary — now we know where she learned it.