Did Joan's adultery ruin her character?
She wasnt wearing a ring thru out so I figured they'd just articulate that she was divorced. When she dropped it that she was married with kids....and then just lets the audience know she has affairs at this convention ever year...that totally killed the sentimental vibe that had been building when Tim and Joan first meet.
Why would the director put that in?
It was bad enough to put the over the top and useless house party scene in...but the movie just died when it turned out Joan was married IMO.