Indeed McKay looks extremely unhappy, but it was a very warm afternoon as I recall as I was at that match, which could help partly explain tempers flaring. On the socks, I remember Burtenshaw usually wearing socks with very long white turnovers and only swopped to the other extreme in the latter part of his career. As I started refereeing a few years after this picture was taken, I always thought the long turnover looked a bit ridiculous but in this case you could argue it helped differentiate between the Spurs’ socks of dark blue and white. Apart from physical characteristics Timbo (thinking back to your previous post), turnover length was often a way to recognise referees - Roy Capey started wearing socks where black would reappear at the top of the sock, as did Gordon Hill after the FA/FL stopped him wearing all black.
Oh dear re-reading this makes me sound eccentric to put it politely, but your post and the picture just prompted some distant memories so apologies!