Moores Law

Hey. Just noticed that the 'Green Glow' is back in this episode. It appears in the scene between Joe and Gordon playing pool. Here the green light is reflected off the baize. This has been bugging me since the season one closing episode (1984) where at the office party, the whole cast seem to be bathed in a horror-movie style green glow and it's appeared in every season since. Very strange. Anyone else notice this?