In the scene where Kelly & Donna are having their boutique's opening party, Kelly calls everyone to gather round. When Donna and her feet come into view, she's wearing comfy, furry slippers. Then after a shot of Brandon, the camera pans back to Kelly and Donna, and now Donna is wearing high heels.
In the scene where Val and Noah are walking through his parent's house, Val walks into the house wearing strappy sandals, then when they enter the kitchen she is wearing chunky clogs.