Continuity mistake: Various scenes in Cowley's office throw up numerable continuity problems such as lighting levels, the buttons on Bodie's shirt and Bodie briefly undergoes a change of hairstyle. All this seems to underline the suspicion that the episode underwent a lot of re-shooting several weeks or months after the original filming, and that the finished scene was "cobbled together" from various shots filmed weeks or months apart.
Continuity mistake: There is something very strange about the filming of this episode. Scenes such as that of the newly-weds in the hotel grounds were shot during summer, while others such as the truck driver being gunned down involve bare trees and actors' breath visible, so obviously filmed many weeks later. Also, the drive-by shooting at Mr May's (the old chap with the dog) and subsequent arrival of a CI5 squad car arriving are two scenes that were filmed months apart: in the latter the trees look noticeably barer than when the villains' car roared past.