"The Chipmunks: Behind the Squeak" (9:40) is a lame faux documentary style look at the Chipmunks as though they were real. "A-Nut-Omy of a Scene" (2:40) is an examination of the effects used to put digital chipmunks in a scene with actors. "Meet the Stuffies" (3:09) is a production-type feature with a look at the puppets that were used on set for actors to focus on. The final option from the featurette menu is "Shake Your Groove Thing! With Rosero" (8:58), which teaches viewers some dance moves to accompany the music. You can also practice these moves with the music video selection if you wish, though I think that ones more for the kiddies.
Alvin and the Chipmunks: The Squeakquel is pretty entertaining at parts, but the experience as a whole is really a big letdown. The plot is weak, the dialogue talks down to the viewers, and throughout it all only a handful of scenes really rise above the rest. This is ultimately a film that will only appeal to the much younger members of the audience, and even then there are still better forms of entertainment. The audio package is solid. The extras are worth digging through and there's a decent selection of features. Overall this release is a rental for those looking to entertain the kids with Alvin and the gang.