When Peter mentions his kids, along with the Nick at Nite line-up, he does not mention Meg, which is a running gag on the show. Her name is mentioned in the musical number shortly after.
When an episode using a score written by Walter Murphy is being recorded, the piano parts are typically played by pianist and arranger David Loeb, who also routinely conducts the Hollywood Bowl Orchestra and is the Director of Jazz Studies at the University of Nevada, Las Vegas.
Bertram, Stewie's long lost twin brother, is named after Bertram Grover Weeks from The Sandlot (1993).