When the audience first see Maddy and Jonathan together, there is no rear-view mirror in Maddy's Volvo, making it an MOT fail in the UK. This is very common in both film and TV. In many cases the mirror is in place for long shots but missing in close ups.
In the prelude the brand name of the banana is "Tonga". Tonga is a kingdom in the Pacific which produces many fruits including bananas.
While Anthony Head only appears as Adam Klaus in the pilot and Klaus doesn't appear in this episode, Head's Head can be seen on the 'Klaus' poster over Jonathan's shoulder when on the phone to Mardy. Meaning Anthony Head IS Adam Klaus in two episodes not just one!
Bernard Kay, Maureen O'Brien, Robin Soans and Geoffrey Beevers all appeared in the classic series of Doctor Who. Geoffrey Beevers was also married to actress Caroline John who played the first assistant to Jon Pertwee's Doctor in Season 7, U.N.I.T scientist Liz Shaw who appeared in four stories during 1970.