When Barlow is giving an interview on the evening news, a black and white clip of the strikers is shown outside the factory in snow and sleet, even though the weather that day had been fine. In the following day's action, the weather had deteriorated and the same clip was used again, but in colour.
During their TV interview, Barlow and his interviewer look up to the blue-screen CSO/Chromakey window as the pre-filmed report is being shown. However they - in the studio - wouldn't see the footage; it would only be visible to viewers as an electronic effect overlaid onto the screen.