Continuity: Mr. Lucas says the figures for the previous Monday were 325 pounds, and at that point in the day the departments combined (170 and 150) were up to 320, five pounds short. However, later when Mr. Rumbold is talking to Mr. Grace about the sudden drop in sales, he says they are "still 20 pounds short" of the previous Monday.

Revealing: At the beginning when Mr. Harman brings in the male robot, he says that Mr. Lucas is coming up with the female one in the goods lift. Actually, one can see Mr. Lucas standing with the robot behind Mr. Harman waiting to come on.

Other: When Mr Humprhries is talking about the whereabouts of Mr Grainger, explaining about the inability to remove the Al Jolson make up, you can see John Inman looking up before having his face shadowed by a boom mike.

Revealing: At the end, when Mr. Grace is inspecting the Father Christmases, you can see his secretary behind the scenery waiting for her cue.