More anachronisms
Some of the anachronisms cited above are nitpicky - who is likely to know that a particular key is for an Italian lock? But the more obvious ones, such as the parking lineson the streets - are irritating, pull you right out of the film, and are easily avoided.
A few more:
One of the characters says *beep* - very unlikely for 1950 Scotland.
The police car sirens (which are very noticeable) didn't exist at the time - they would have been bells.
All the men's hair is too long.