In the series finale, "Fly Away Home", at the beginning of the episode Lisa is preparing for her upcomming wedding. She and Tia are talking about all the changes that are going on. Lisa is having second thoughts about getting married, when Tia reassurses her that everything will be fine. The slip-up was that Tia remarks, "Do you remember what you told me when Ray first suggested we move in?" No he didn't! In the pilot episode "The Meeting" Tamera was the one that suggested it. Ray was totally opposed to the idea at the start. Maybe it wasn't big, but it was still a mistake.