Correcting profession in a TV-Series

In the TV-Serie https://www.imdb.com/title/tt0169484 there is shown a wrong profession/function of Helga Mauersberger ... producer: NDR (52 episodes, 1966-1970) in the producers departement. She is not the producer, but the Commissioning editor (Redakteur) of all episodes. How can this be corrected for all episodes?