Found this quite amusing.
Recently watched two concerts: Bowl '82 and Wembley '86 1st night and noticed that there are the same guy that is caught on camera on the front rows.
here on 2:26 at the bottom centre with red hair and cap link
and here througout the vocal duel with audience, most noticeable on 34:30 on the left link (sorry for the source, didn't find it on youtube)
Have anyone noticed some stuff like this on Queen taped concerts?