It's easy to forget how primitive communications were back then. In the late 60s - when United played away - it was normal to go and watch the reserves play at Bramall Lane in the Central League. Part of the attraction was that there were always plenty of people with transistor radios who would know the latest scores.
On January 18, 1975 I went to see United play at White Hart Lane (we won 3-1 - Currie, Eddy, Woodward. This game was in the top flight and Derby would win the title under Brian Clough. Spurs were piss-poor and would finish fourth-bottom, we finished sixth and just missed out on a place in Europe. The crowd for this Saturday afternoon fixture? 15,812. The following season, I went down again, we lost 0-5 and finished the season rock-bottom).
Anyway, I digress. I was stood on 'The Shelf' and, at half-time went down to the tea bar. The game was being televised and, under the stand, was a small 'cage' made of that tennis-court wire. This was the 'command centre' and housed a bloke, a camera, a small monitor and a bunch of cards with most conceivable scores (3-2, 1-3 etc.) in Letraset which they propped up in front of the camera as the score changed.
Even more primitive, televised cricket in the 60s (?) used to have the score card hand-drawn in a calligraphic style (Copper Plate) which they put in front of the camera. When I went to the cricket at Bramall Lane, they sold little score cards which were updated whenever a wicket fell.