Factual error: A plastic bag of items is found under the footboard. Plastic bags weren't invented in 1969. They first appeared in public in 1979.
Factual error: Two vehicles in this episode date from after 1969 when this episode is set: in the first scene the Austin Maxi is a 1971 model, and the mobile library is J registered, which means it was first registered after August 1970.
Factual error: The Austin 1100 police car has a northern Irish number plate, despite being set in Oxfordshire.
