Sistering

While on the arcade dance machine with Big Suze, Mark thinks "She's probably got a title, she's just too modest to say." In real life, Sophie Winkleman later married Lord Frederick Windsor (son of Prince Michael of Kent, a cousin of the Queen) in 2009, thus she is allowed to use the title Lady Frederick Windsor, however she has said she doesn't plan to use it.

In this episode (from series 3) Mark tells his sister that, among other things, Jeremy has chlamydia, to which he replies (almost with pride) '..it's symptom-less'.

However, in series 5 episode 1 Paula tells him she has the disease, that it is symptom-less, and he should consider getting tested. From his surprised reaction to Paula telling him that he might have it (for example, he appears excited when he ponders that maybe he 'could get into this'), it is obvious that he did not know he had it before she tells him now in series 5, and by implication this is the first time he has even considered he might have it.

Also, later in the episode, after Jeremy tells him, Mark says 'You finally caught VD' implying this is the first time that he is aware Jeremy has ever had the disease.

Features Blitzkrieg II (2004)