In the segment before the credits, Julia turns off her mic but the on-air light does not turn off immediately. When she cuts Frasier off, she turns her mic back on and starts talking, but the on-air light does not turn on immediately. The mic button relay is an instantaneous event which creates no delay.
Bulldog says, "People stopped saying 'turned on' twenty years ago." But less than eight years ago, in Someone to Watch Over Me (1995), he says, "I've never been so turned on in my life!"