Continuity mistake: After Winston opens the cage and lets Dog and his gang into the house, Dog grabs him and headbutts him hard in the face, but Winston has no blood, bruises or swelling on his face at any time afterwards.
Suggested correction: Later that day, when he is being interrogated by Rory, there is definitely a mark on his forehead.
Continuity mistake: When Gloria picks up the Bren gun, we see Winston and Charles sitting up looking at each other in surprise, but seconds earlier, both had been tied up on the floor.
Suggested correction: When we see them tied up, they were lying on the floor. A little bit of time passes: we see the van at least halfway loaded; they knock out the traffic warden, etc. Safe to say that Dog moved Charles and Winston out of the way, against the wall, so they can bring the money and weed out easier.