Hyacinth Bucket was voted "One of the most annoying characters in British television".
She'll sing at me, I know she will.
In most episodes following the introduction of Emmet, he is frequently seen to stare out the side living room window of Elizabeth's house at the assorted goings-on next-door at Hyacinth's. However, all exterior shots of the house clearly show that there are no windows on that side of this room.
During the end credits, we see a table set for a posh dinner. When all credits have been shown, Hyacinth is shown rearranging a fork and a spoon and then putting a name plate on the table. As the camera zooms in on it, you can see that it reads Harold Snoad and the words "Produced & Directed by" appear above it (plus a copyright notice below it).