Glasgow as Philadelphia
So, they film Glasgow Scotland and call it Philadelphia.
As I watched the opening, I could not place any of the streets as any that I know in Philadelphia - even thought I have not lived there for 30 years.
Then while watching the special features I see they substituted in Glasgow.
Looking for the "why" I find that it was because Philadelphia would not kick in enough Tax breaks to appease the filmmakers (more corporate welfare).
I would have preferred that the movie just be set in Scotland rather than fake Philadelphia (or any other US city).