Family matters. Rules are good; always being able to do what you want isn't as fun as it seems.
Chipmunks make slightly inappropriate remarks, especially Alvin: "You're hot," "You're such a buzz kill," "She wanted you," etc. Ian calls the chipmunks "rats" and tells them to "make love to the camera" during a photo shoot. They also tell Dave his music "sucks."
Several scenes involve the chipmunks watching SpongeBob SquarePants or eating/heating Van's waffles. Also: Hummer, Porsche, Entertainment Weekly, Spin, Billboard, Apple laptop, Bose speakers, Tobasco sauce, Bob Dylan poster, and various recognizable toys and games.
Nothing notable: A glimpse of adults drinking champagne at the big launch party.