Victoria Williams's character in this series is named Marjorie Dawe; this is a reference to the popular nursery rhyme "See Saw Margery Daw".
Mossop and Tiddler are called The Riddlers because their main aim in life is to "riddle things out".
When Mossop and Tiddler appear in the opening titles at 0:19, the theme music (composed by Neil Innes) briefly changes to a terrifying and sinister theme, misleading some younger viewers and small children into thinking that Mossop and Tiddler are scary and unfriendly characters and causing them to be frightened.