In the final scene, a live band is shown while "Sing Sing Sing" is being played. However, the dancers are performing to recorded music instead of live music. The drummer and pianist's arm movements aren't synchronized with the song.
Shortly after Raymond walks in on Robert dancing with a mannequin. the edge of the wall in the set can be seen to the left of the screen, complete with black marker writing and tape. As the scene progresses, the cameraman slowly moves the camera to the right until the edge of the wall is no longer visible.