When Don walks in his office to find Wendy sitting cross-legged on his couch, her skirt is pulled up, showing both legs, and the stethoscope she is wearing can be seen dangling against her left leg. In the next shot of her, the skirt is pulled down, and the stethoscope is not visible. In the final shot before she gets off the couch, the skirt is back up and you can see the stethoscope dangling again.