There are sometimes odd versions of films seen on television, which have pieces of footage never seen anywhere else. I've seen things on 'never before released' editions which have definitely been on things I've recorded on television, even when some of the language is censored and so on!
A friend of mine, who has children, had a copy of 'Bedknobs And Broomsticks' she watched with them for years, originally broadcast on the television. There was later some sort of version released with scenes which had supposedly never been viewed by the general public before, but they were all on her copy which she had made years before that time.
There was actually a version of 'Alien' which was on television and where there was a shot of the lights on the Nostromo turning on when they were on the surface. On the video I got a few weeks later and saw fo rhte first time, it just went to the lights already being on.
It's unusual, but can certainly take place, from time to time.