-There are four leads, two of which are on the poster. The ones that aren't are 18-year-old Adam G. Sevani (reprising his role from Step Up 2) and 17-year-old Alyson Stoner (reprising her role from Step Up). They are, apparently, the only actors who arrived on set.
-About an hour into the movie, there is a musical number set to a remix of "I Won't Dance". It's a single take, features Sevani and Stoner, and is the most charming thing I've seen since "He Loves and She Loves" from Funny Face.
-This iss the least intimidating antagonist I've seen since Michael Beck's pants in Xanadu.
-The first dance troupe our heroes go up against should have won.
-3D is a great asset, since now you get a since of depth. The dances more than benefit.
-Harry Shum Jr. is in this! You may know him as Mike "Other Asian" Chang from Glee!
-The "lead", played by Rick Malambri, is never called out for bullying other people, taking advantage of others, guilt-tripping kids, and being an overall douchebag. Least likable human being in the movie.
-Two writers are credited. I think they're exaggerating by at least three.
Overall, great fun, but I probably won't remember a lot of it by morning.