On the white car park wall next to the public toilets, in all the scenes before Mark steps out in front of the car then meets back up with Jeremey, the wall is plain, however in the final car park scene when Jeremy and Mark meet back up, the wall has the word 'Psyco' (sic) graffiti'd on it in blue spray paint.
When Mark walks up to the door of Sophie's parents' house, some lighting equipment can be seen tucked away in a corner of the porch.
Before the scene where they stop in a car park so Mark can clean his hat and shoes, an establishing shot of a street with a market is shown. This is Wentworth Street in the East End of London, which is a different area to where the scenes were actually filmed, in Harlesden in North West London.