At the beginning it shows two tower blocks, then the scene moved to jack and victor in their flat. These two tower blocks suggest that this is where they live which is wrong. They live in Opsprey heights which is a different tower.
The external stock footage of the building used is wrong.
A flashback at the end, shows Jack, Victor, Isa and Winston as friends as young adults sometime in the 1950's. However, in the Hogmanay special 'The Party' the audience sees the three men meeting Isa for the first time in 1975.