When Fran is introduced to the boy and she shows him to the piano, his glasses disappear and reappear.
At around 11:15 when Keith Rosenstein visits Fran, he is not wearing his glasses for a brief moment. In the next scene, when she goes with him to the sofa, he suddenly has his glasses on again.
When Bette is chasing Fran through the mansion, they run across the living room, back past the guest restroom, then left behind the glass doors. But running after both of them appears to be Yetta, however she isn't in the scene.