1) The five frames allegedly showing something flying into the Pentagon. the whole idea that you would release only the evidence from the lamest camera to capture the event (if it's true that those cameras only record one frame per half second which I don't necessarily believe) is ridiculous and suggests to me they needed something that they could credibly falsify. 5 frames are much easier to fake than 30 frames.

2) Alleged eyewitness testimony. While I have no evidence that the CIT witnesses are acting, neither can I easily dismiss the possibility.

Given the weakness of these two batches of evidence, I believe the best approach to questioning what really happened at the Pentagon is to first and foremost insist the official story be proven. A flyover is not proof that AA77 didn't fly into the Pentagon, after all. All those north side witnesses could have been distracted by the flyover plane and not noticed AA77 flying along its normal course. Not saying that's realistic but someone could argue that and we'd be back at square one trying to explain to people that what matters is not whetehr a plane flew over the Pentagon but whether AA77 flew into it.