McCann's One Year On-Yet Another Incongruous Media Moment?

I watched the interview on BBC 1 with Madeleine McCann's grieving parents Kate and Gerry McCann, and listened with sympathy to how they had 'steeled themselves' for the interview with the BBC, how they had ' nearly not gone' to the interview.
There then appears a moment when the interview is clearly over, but the camera continues to roll, this appears at 2 minutes and 44 seconds into the clip , at that moment the demeanour of the couple appears to change dramatically, from sombre steely solemnity, to what can only be described as expressions which are something akin to a moment of bar-room bonhomie.



I still have an open mind as to the fate of young Madeleine, but I have always expressed the sincere belief that eventually the truth will out, as to how this young girl disappeared.
I do have to confess however to being continuously wrong footed by the body language of this couple. They appear to be able to adopt one persona one moment and another a few seconds later. Is there something innate to the humanity of us all that allows us to perceive sincerity?Speaking personally, when one fails repeatedly to receieve the usual visual cues which signify this quality of sincerity, is it any wonder that ones normal default position of sympathy and belief is challenged?
The premise of the interview was that the couple had struggled with the emotional challenge of discussing the anniversary of their daughters disappearance at all, then when the interview appears to end, the visual image that leaps from the screen completely undermines that premise.
It is also interesting that the editors at the BBC chose to retain that section of the footage on screen, that surely was not an error.
I would rather not have seen it, because as with the other jarring incongruities about this couples body language throughout the past year, it makes disturbing viewing. Why? Because it rakes up that nagging doubt once more as to why these discrepancies continue to arise, disjunctures between what this couple say they are feeling and how they actually look.