Mike Sentinal's "Subterfuge" is lensing at Elstree Studios in Boreham Wood - just like this Saint episode, in something of a cost-cutting move.
The newsreel footage at the start of "Marcia Landon's" funeral is actually that for Ivor Novello from 1951.
The actress Eve Eden who played Marcia (only one photo is shown), She appears in a bar scene in another episode of Saint, titled "The Ever-Loving Spouse" Season 2, Episode 26.