Other things that come to mind are the pictures on CNN. I saw one of the towers in NY burning and suddenly thought "hey, is this a replay? no, the guy is talking about the (first) plane" and I saw the second one crash. But those pretty big machines also only left rather tiny holes compared to their size, the wings of boeings and other aircrafts are rather fragile. But the impact still was enough, more than enough.
Movies and all pics can be misleading or faked even, if you think/believe/saw/know that two airplanes hit the towers why doubt that another one crashed into the pentagon?
Don't believe everything, question everything. Get your own opinion and don't repeat other's. If you got your opinion, back it up, but try to get material other than dubious flash/powerpoint presentations I could fake way better with a little use of photoshop.