Movie Digger has compiled a list of the ten dumbest moments in otherwise very successful (i.e., “blockbuster”) SF movies. I think there are a couple of notable omissions (:::cough:::…midiclorians…:::cough:::), but it’s hard to argue with any of the ones they selected.
The raptors, despite having acorn-sized brains, seemed to have no problem navigating a vast building they’d never been in before in order to corral Sam, Laura and the kids in the lobby. Maybe the T-Rex came in and ate them just for their severe lack of credibility.