Glasgow melts into Edinburgh

I always thought I lived in Glasgow. However, I found out that a pub close to me called Crosslands on Queen Margret Drive was actually used a location for the film Trainspotting. This is particularly weird, because Trainspotting was actually set in Edinburgh. I assume it was cheaper to film in Glasgow. It has been a while since I have watched the film, but the pub features in the scene where the nutter throws a glass over his shoulder. It is a local pub for local people. I don't go in there too much, (except when I need to spread my message of temperance). What does it mean, when a pub in a film set in Edinburgh is actually in Glasgow? Reality can no longer be trusted. Glasgow and Edinburgh are merging.