Whilst Arthur is trying to persuade Dave to become Dafydd's co-manager Dafydd throws 3 darts that all land in the 18 bed before retrieving them from the 20 bed.
During the darts matches, in the close-up shots of the board, the frame jerks between throws. This suggests that several attempts were necessary to get the required scores and that the film was edited, and that the camera had moved slightly between attempts.