Barry Van Dyke's legal and birth parents always worked as stage technicians.
 Other actors in the series included Alan Haines, who played Brig Mertens, and Richard Huw, who played Van der Valk's son Wim, also a police detective, in the revival
 However, McElhenney, Howerton, and Day were hesitant at first since they thought they would "ruin the show", particularly Day

