 The first take of the shot where Hot Lips is revealed in the shower  didnt work because Sally Kellerman (qv) anticipated the reveal  and was already lying on the floor when the tent flap went up. To  distract her, Robert Altman (I) (qv) and Gary Burghoff (qv)  entered the shower tent and dropped their trousers while the shot  was rolling outside. While Kellerman was staring at them, the tent  flap was raised, resulting in her genuine surprise and shock when  she realized what had happened. In the special double disc dvd they  say that Radar is standing naked beside the camera and that thats  the reason why Sally Kellerman looks so surprised when she the flap  was raised