Almost certainly a printing error which was quite common back then when there was a load of manual processes involved in creating each page. For photographs to be printed in those days you had to scan it to create 4x colour separated negative films of the developed image, one each for Cyan, Magenta, Yellow and blacK. Each one of those films would have been combined with the rest of the page in order to make the plates and only when all four plates are on the machine do you fully know it has worked properly. May even have been a single colour printing press in 1981 where the sheet of paper is passed through four times and the plates and ink are changed between passes.
I’m guessing these were printed between the two games so if spotted on the press, there may not have been enough time to fix it. They have simply placed the photo negatives face up when they should have been face down (or vice versa), probably.