JVM just replayed on TV so I made it a point to watch for the video footage in question. Watching video on my computer right now is not so easy. I watched just long enough to see the footage in question about 3 times. Once a day with Jane, is enough for me, so not going to watch the rest of it. The footage lasts probably 2 seconds, before its covered with all that other stuff.
First of all, it went so fast, that it was one really sharp eyed viewer to even catch that there was a person there. Secondly, the way the whole sequence was edited, there would be no reason whatsoever to believe that the footage didn't belong, that it wasn't part of the story about that night in Sanford. I mean, that is exactly what it is meant to imply, imo. What average viewer would notice or question? So, kudos to those who noticed it and brought it to our attention.