This is the first episode where Ashley Jensen's regular character is credited as "Emma" instead of "Nurse".
The gravestone of Anne's husband shows that his name was Stanley Oliver. That's a tribute to the 1920s comedians Stan Laurel and Oliver Hardy.
Colin Hoult's character was credited solely as "Ken" during series two; from this episode onwards he marks a rare instance of a character being credited by a full name: Ken Otley.