Thanks to Dark Lotus on the GB message board, I was able to follow a vein of articles and information from an old UK magazine that
focused on Spectrum games (the Spectrum was THE gaming system of choice in the UK in the mid-80s). Included in the find were
a preview article just
prior to the release of The Real Ghostbusters game (which covers some interesting material about the movie, the UK comic, as well as the game),
a review of the game an issue later, and the
preview cover, which featured art that obviously used the toys for reference (note the
roof gun chair and the Slimer that looks just like his action figure).
credit | Dark Lotus