In the episode when Chandler gets handcuffed by Joanna, the scene when Joanna walks out of Chandler and Joey's shower, she goes into Chandler's room and shuts the door. Rachel, Joey and Chandler are talking and as the camera cuts between them you can see a closed door behind Chandler. In one cut you can see that the door is open but Joanna has not come out of the room because they are still talking about her