parttime crackhead
Bluelighter
Its either set there or really cleverly edited - now that you mention it I could see where the breaks could appear, where Scarlett could be in another country but its so fn fluid / natural. If the director wanted you to think it was shot in Glasgow - it worked. (Yeah I could pick holes in it [but cant we do that with any movie]) its creepy, strange, gets you thinking, makes you feel uncomfortable about human nature without heavy CGI.
She definitely filmed it in Glasgow, I remember hearing about it at the time. I just wondered if it was meant to be Glasgow in the film. Like, they shot some of World War Z here but it was meant to be Philadelphia.