(series 4) Many of Bassie's dream sequences were cut from the final edit of the series, due to many problems on the set.
(series 5) The replacement of Harry Dikmans by Joop Dikmans as B2 is often attributed to scheduling conflicts. A different story was told in a YouTube documentary about the 35th anniversary of Bassie and Adriaan on television, in which Bas van Toor claimed that Harry Dikmans's demands were too expensive.
Every season Bassie and Adriaan try to have a vacation without any villain trying to mess up their holiday. It actually takes them 10 seasons to be able to celebrate a quiet holiday, and even then they have to take the time to save animals from a huntsman.
As far as the pandemic measures allowed there was an exhibit in Museum Vlaardingen in the Netherlands in the city Vlaardingen between 14 October 2020 and 16 May 2021. The exhibit showed props from the television series.
(series 8) Paul van Gorcum designed the Baron's suit himself and had it custom made.