Walter reads De Standaard newspaper. De Standaard is a Flemish daily newspaper, traditionally associated with the Christian-Democratic and Flemish Party.
The Gazet van Antwerpen (Antwerp Gazette, popularly named De Frut, "sour head cheese") is a Belgian newspaper in Antwerp and Flanders.
The episode title "Moord op voorschrift" is translated in subtitles as "Prescription Murder." This is almost exactly the same as the title of the pilot and very first episode of Columbo, Prescription: Murder (1968).
At 55.19 in duration, this is the longest episode to date.
John's phone number is +32 489 25 39 04. +32 is the International code for Belgium. The same number is given for Jasper's phone in s3e10.