Unlike its parent series Département S (1969) (shot entirely on 35mm film), this series made use of the cheaper 16mm stock as a cost-cutting move by ITC. This was something of a trade-off, as star Peter Wyngarde was able to be genuinely seen in international location shots interacting with local landmarks. The writing team could then decide how to best integrate this footage in their scripts.
Mindful of how long Peter Wyngarde took in the make-up and hairdressing chair each morning on Département S (1969), the producers simply provided him with a wig to wear on this show.
Jason's publisher Nicola Harvester is played by Anne Sharp. Until his death in 2006 she was the wife for almost fifty years of series producer (and Jason's co-creator) Monty Berman.
Reportedly Peter Wyngarde asked Lew Grade if Joel Fabiani could reprise his Département S (1969) rôle of Stewart Sullivan to partner him in the new series, but the mogul was keener for Jason to have solo adventures.
Jason's favourite brand of cigarette is Sobranie.