Genius Bonus: The Deleted Scene song "Mona Lisa" contains the lyric "and a smile like you're hiding a dick." On the surface, this is just another line indicating that Conner thinks the subject of the Mona Lisa is ugly. But this is actually a reference to the (debunked) theory that the model for the portrait was actually a man in drag.
Jerkass Woobie: Connor. On the one hand, he is extremely insensitive, self-absorbed, and unapologetic about taking all the credit for his music. On the other hand, as his celebrity life collapses, he really doesn't know how to handle anything and doesn't seem to realize that he's pushing away the only people he cares about.
Sampled Up: The hook for "I'm So Humble" samples the obscure doo-wop song "Heartaches" by The Marcels.
Special Effects Failure: The home movie footage of infant Connor's drum solo is clearly just an adult with a baby's head superimposed over it.
Tear Jerker: The death of Maximus. As goofy as it is, poor Conner is genuinely crushed when his beloved turtle dies. Connor crying through Auto-Tune on the soundtrack version wavers between ridiculous and actually sad.
Trailer Joke Decay: A lot of the best ones get hit with this, such as Seal's wolf attack, Adam Levine's holograms, Owen's DJ head, and arguably the footage of Connor playing drums as an infant. It doesn't help that they were basically displayed in their entirety before the movie's release.