The thing was in 1968 is that they thought you may see the film once or twice and not notice things like Tilbury power station then the days of Video and DVD came along and we all have seen it a hundred times or more, I still find things I had missed each time I watch the 69 BoB film.

North Wealds tower covered in a camo net

the roundels on the HE111s

the list can go on but I cannot remember noticing anything in 1969 when I went to see it, I was blown away just like Duxfords hangar