I just watched it for the second time XD

when Kronk and Yzma go to her secret lair via themepark ride the "Small World" song plays

during Yzma's musical number there's a part where the vials of "youth potion" pop their corks, just like the wine bottles in "Be Our Guest"

during the ending credits there are "photos" of the characters and one is of all of them at Walt Disney World in front of Cinderella's castle wearing Mickey Mouse ears