When Rob Jarvis's character, DS Justin Morris enters the UCOS office, he asks for Jack Halford and Jack greets him as "DCI Barney Morris", but on the closing credits his character is credited as "DS Justin Morris".
When Pullman and Halford search Johnny Tevis lockup, they disturb paint on the wall revealing gold bars underneath. They came from a robbery in the 1980's. Even then, all standard gold bars were trapezoidal (Length: 250 mm, Width: 70 mm and Height: 35 mm with a 5.25% slope), not brick shaped. They would not fit in the wall as shown.
When Brian is looking on the computer for information on Adrian Osler, the screen heading is misspelt 'Search Indiviual'.