When Prince Charming meets Anastasia for the first time, he recognizes, slipper or no slipper, that she is not the woman he fell in love with. Lady Tremaine overcomes this obstacle by mind-wiping him with her wand.
Cinderella watching an Evil Twin of herself emerge from the shadows while getting ready for the wedding.
The entire sequence where Lady Tremaine uses the Fairy Godmother's wand to turn back time, wherein we don't just see the events from the first movie being put in reverse, but Cinderella and Prince Charming are seen being literally torn from each other. And then it zooms in on Lady Tremaine's face, with a look of sadistic glee as she revels in the power she has to destroy her stepdaughter's happiness.