When Bob gets out of the taxi in 1983. He walks past Banners Est. 1992. But there are many other great anachronistic things to spot for the pedantic. Dave's tv and remote for example.
The house used for the meeting scene is on Ridge Road in Crouch End which is about 1/2 mile from the actual real house. Also the house used is a 1970's time-warp and very little was done to alter the house other than a few dressings.