In the interview noted by FR at this link
http://www.freerepublic.com/focus/f-news/1876569/posts
Romney claimed it was secretly videoed. I was there and a the video guy set up the the big old cam a few feet from Mitt and it had the usual red light when recording.
Mitt repeatedly said he was videoed without his knowledge.
I have a good memory but it sometimes fails me in embarrassing ways. I am not inclined to think that Romney lied when a lapse of memory is also plausible.