In my universe, he has a minor role in Death Watch (1980) a film which caught my attention at a young age. It tells the story of a woman with an incurable disease who will be filmed 24/7 until her death.
Its theme is still my theme: technology, reality television and its impact on society.
Von Sydow has but a minor part in this film.
Speaking of reality television. The most underrated film with reality television as a trope is Paul Bartel’s The Secret Cinema (1968).