After Lisa installs the TiVo and begins to fast forward through the adverts for Itchy and Scratchy, we can see a number of commercials featured in Simpsons. Included are the "Mr Sparkle" commercial from season 8 and the SpringShield ad from Season 13.
Krusty's song in the funeral is a parody of Elton John singing "Candle in the wind" at the funeral of Princess Diana.
The title is a reference to "Funeral for a Friend".