Yes, I remember that clip well. Filmed on the pilot's mobile phone iirc. It did indeed look very odd, and the pilot seemed to be puzzled by what he was seeing. The movement of the passengers walking along what seemed to be a walkway leading nowhere was oddly jerky. It definitely looked spooky. It seems strange that the pilot didn't realise it was a reflection - though of course it could be that he did realise what it was he was seeing but recognised how creepy it looked and wanted to 'big up' the weirdness.
I enjoy P:COC and always watch it with the attitude of curious sceptic (cos I hate the thought that anyone can dupe me!!) - and I do my best to take everything the talking head 'experts' contribute with a large pinch of salt. Their bits are clearly mostly padding to stretch the episodes out to the running time, and they always come across as far too willing to believe.