I'd say it's more likely all of his jabs at NBC. From one of this week's monologues, for example:
“According to several reports, scientists say they are getting closer and closer to being able to do Jurassic Park-style cloning of extinct species,” Leno told his audience. “Imagine that. Things that were once thought to be extinct could be brought back from the dead. So there’s hope for NBC. It could turn around.”
Carson routinely gigged NBC. I’ll never forget the failed NBC series “The Montefuscos” only because Carson used it as a running gag for about three years. But like all communists, NBC and their masters in the white house have no sense of humor about themselves. So Leno must go. He was the last equal-opportunity mocker. Now it’s all party line humor, all the time.
These “entertainers” are just boot-licking court jesters, crawling on their bellies for the occasional pat on the head from their king.