In the second scene of Saffron and Gerard in the kitchen, June Whitfield and Joanna Lumley can be seen at the top of the stairs waiting to enter the stage.
The song Edina sings when her speech has gone missing is Bird On A Wire by Leonard Cohen.
Why would they leave Eddie's microphone on while Ping is talking?
Eddie: I piss better ideas than Gloria Ping!
By the time this episode was written, it was already revealed that the show would be going off the air, and the final two episodes were planned out in advance. So technically, this is the last episode of AbFab until season 4 started years later.
The shot of Eddie & Patsy was flimed on a real garbage boat going through London. However, they had to film it at 6AM, since garbage boats aren't allowed through the city during business hours.