That's all. The characters are all intelligent and attractive and capable and good at their jobs (which Hollywood displays by putting the woman in a pantsuit at some point), but they're also awkward, and nothing says awkward quite like tripping on a dress (or on 27 dresses, as the case may be).
Clumsiness and a general lack of coordination can be a part of awkwardness, but if you ask Hollywood, it's the only part. If falling down was the beginning and end of awkwardness, I'd be thrilled. I fall down a lot, certainly more than you'd expect from a person whose legs function, but I also turn bright red whenever I get nervous, which is always, and I will carry on a fake conversation on my cellphone if I'm at a party and don't know anyone for hours. I tell movie theater ushers "You too" when they tell me to enjoy the movie I'm about to see, and the other day when someone on the street asked me for directions to the beach, I said, "No thank you," because being awkward means finding new and exciting ways to say the wrong thing, always always always.
This is closer.
The "awkward" women trip and bump into things in their movies, but before and after they trip, they dance and smile and maintain healthy relationships and successfully navigate social situations that would be terrifying for a genuinely awkward person (re: all social situations).