Continuity mistake: When Sam sits down next to Carol Twilling on the bed, asking, "Do things ever get a bit frisky?" the top button of his shirt is undone. The camera cuts away and back, only to find that there are now miraculously two buttons undone, not just one. Sam has not moved in this time.
Continuity mistake: During the scene between Hunt and Tyler, which takes place directly after Hunt has been "communicating" his outrage to Dickie Fingers, by hitting Dickie's hand repeatedly with a telephone, Hunt puts his hands in his pockets. However, in the next shot, which is the opposite camera angle, Hunt's hands are suddenly back out of his pockets. When the camera angle changes again, they're back in, all with no movement on Gene Hunt's part.