Corrected entry: In series one, all the characters watch the 1973 Grand National. In episode 4 of series 2, Gene Hunt is reading a newspaper with a headline referring to Crisp entering the forthcoming Grand National and the weight handicap. Crisp was the runner up to Red Rum in the 1973 Grand National due to its weight handicap disadvantage.
Corrected entry: In the second series episode involving the Asian drug dealers, they seem to be unaware of heroin. Given that it is set in the 70's and drug use was widespread in the 60's, especially heroin, you would think police officers would be aware of it. That and the classic cop movie of the early 70's, The French Connection. Surely the gene genie would have seen that.
Corrected entry: The Ford Zephyr police car has a G registration, which means it was first registered between August 1968 and July 1969. This car is a Mark 3 model, which ceased production in 1966, so the latest registration letter it should have is D. This programme is set in 1973, even then I don't think the police would be using such an old car.