 When Victoria Principal (qv) opens the shower door in the infamous  Bobby shower scene, actor John Beck (II) (qv) was the one in the  shower. The shock to Pam was supposed to be that he had been killed.  The shot of Patrick Duffy (I) (qv) was inserted later. Actually  Pam would not have been shocked to see Mark (John Beck) in the  shower considering that his character had been brought back during  the "dream season" and she had married him earlier in the very same  episode.