During an exchange with Keith, Bookman mentions that, in order to deal with his problems, Keith had "hit the bottle". This line didn't make as much sense in the original airing. Bookman was referring to incidents from the episode The Evans Dilemma. However, this episode never ran on the network and was not shown until the show went into syndication. Therefore when the comment was made in End Of the Rainbow, it sounds like an unnecessary and possibly unsubstantiated verbal jab.
This was the series finale.