Nellie developed a passion for "Edward Woodworm" whilst watching the series.
Mentioned when introducing panellist Edward Woodward.
"Satisfied, Callan?" Miss Brahms asks Clegg, the Grace Bros store detective.
Robert McCall is classified as code red, a reference to his earlier series Callan, where a red file meant the person was very dangerous.
Callan meets Patrick Glover (from Thames stablemate "Father, Dear Father") in a sketch.
Tilt of the hat to/spoof.