The flashback scene was the last scene of the series to be shot. It was arranged that way after Penn Badgley decided that after the series he wanted to cut his hair the way it had been when the series began so that they would be able to use his real hair in the flashback.
Taylor Momsen's final acting appearance.
The film poster that Nate is seen holding in the final scene is titled 'Ivy League: The Twisted Tale of the Female Con Artist who took Manhattan for Millions' and is based on the fictional best-selling autobiography by the equally fictitious Ivy Dickens. The fictional film stars Lola Rhodes as Ivy, Olivia Burke as Serena, and Isaac Gabaeff as Dan, and it is directed by Hollis Meminger. The character Ivy Dickens is also credited as one of the executive producers and the screenwriter.
Rachel Bilson recites lines with Kristen Bell, for the fictional upcoming movie "Inside Out." She's auditioning for the role of Blair. In real life. Blair, played by Leighton Meester is married to Adam Brody. Adam Brody and Rachel Bilson not only co-starred on The O.C. (2003), but they also dated.
The song played during the final scenes of the show is called "Kill Me" by The Pretty Reckless. Taylor Momsen, who plays Jenny Humphrey, is the lead singer.