Video was typically projected on a screen from a 3-CRT projector; on SIA's 747-400, on upper deck business class, the screen was blocking entry to the loo: one had to duck, almost crawl under it .

Funny you should say that. On our outbound transatlatic flight on the 767, they had the big video projector screen, and while the movie was playing, it blocked one of the overhead bins from opening. Someone wanted to get something out of one of their bags, and couldn't. It was rather funny.