The only relatively annoying aspect of the film is the lame dialogue that comes up every now and again. But luckily, the movie usually counters those points by adding in some parodic remark afterwards. Like say, for example, when the evil villain gives a really lame monologue, only to end it with, "My only regret: That this may be the finest supervillain speech ever given, and you don't even know what I'm saying." Lines like this help ease the pain from all the "Disney" moments, which fortunately, don't happen too often. On a different note, I feel the need to address the fake-looking CGI, which is sure to put some people off. If you think you're one of those people, just keep in mind that although it takes some getting used to, the cartoony look of the graphics really helps set the tone of the movie. And what is that tone exactly? It's DAMN FUN, that's what it is!
Alternate Opening (3:20): This nifty opening is perfect for setting the stage for the type of adventure your about to embark on, but it tells too much too soon. The opening they used is a much better fit. However, it was pretty cool to see a little more of Kurt Russell and Kelly Preston in action.
Super-Bloopers (4:18): For the most part, these goofs are funny as hell. Other parts, however, are just sort of amusing to watch. For example, you see a behind-the-scenes look at the kissing sequences with the lead teen male. At the end of each take, there's this sort of awkward feeling, so he just high-fives the chick and shouts, "Whoo!" Heh heh. What a classy lad.
Welcome to Sky High (15:18): Fun, but hardly informative. This featurette contains plenty of interviews and on-set silliness (mostly from the kids). Parts of it are interesting, so I recommend watching it.
Breaking Down the Walls: The Stunts of Sky High (7:00): A much more informative making-of featurette, detailing various aspects of the stunts and wirework. It's as interesting as it is enjoyable. Check it out.
There is also a Music Video titled "I Melt With You," by Bowling For Soup.