Nothing that complicated. Look at the start of this video, at about 0.18-0.20. (apologies for posting the odious things)
http://www.youtube.com/watch?v=9UOL9Jh61S8&feature=related
What do you see? A man in a shirt and slacks (who looks an awful lot like O’keefe), and a woman in revealing clothing (looking a lot like Giles) walking into a office. Pimp outfit? No.
Then, at about 1.15, you see O’keefe, in a pimp outfit, near a car–and then walking down a street. with giles in her outfit ACORN office? No.
It seems pretty obvious what happened–O’keefe goes into an ACORN office in shirt and slacks, and then comes out, shoots a couple of scenes nearby in the “pimp outfit,” and claims he was wearing it all along. Not even high-grade bullshit.
The scene of him walking into an office dressed as a college student seems pretty conclusive. If you don’t think that’s enough, the absolute lack of any video where you see both (1) pimp outfit, and (2) ACORN office at the same time is to me, damning–I just don’t see any proof at all he was in the “pimp outfit” in the ACORN offices, and the sequence at the start of the video seems to clearly show he went to at least one office dressed as a college student.
Add to that the fact that O’keefe edited in scenes later to make it look like he was dressed in the “pimp outfit” all along, and what you have is a good reason to doubt anything they say. As Amarinth says, this doesn’t mean the ACORN workers were perfect, or did the right thing–but it leads me to call bullshit on O’Keefe’s account.
To put it another way, I’d second what Diogenes says–I have trouble believing anything these guys say, given the evidence that something has been tampered with or misrepresented in the videos—the whole point of tampering with the video is to conceal what actually happened. It’s not just that you can only identify some questionable parts–but that the fact that such tampering exists makes me skeptical of the accuracy of the remainder as accurate reflections of what went on in the offices. That’s the point of the selective editing.
If ACORN is really as bad as they say, it’ll come out in the unedited video—and I couldn’t imagine any reason for them not to release it. On the other hand, if ACORN was made to look worse through manipulation of the video and editing, there is a very good reason not to release the whole thing. Given that O’keefe and company have strenuously refused to show the full, unedited video, and given that the editing on the released videos is questionable at best, I can only infer that there is something on the unedited videos that repudiates their story.