Scene: In the barn with the Brain transfer machine. Ms Piggy has just fought off everyone and is on the telephone.

Her back is to the camera (she appears to be hanging up the phone), she turns to speak to Kermit. The receiver is in the cradle in the background.

Watch her right arm when she faces the camera, her hand is out of shot. Then we see her hand, and guess what? She still has the phone in it.