The Secrets of the Back to the Future Trilogy
Starring Kirk Cameron, Michael J. Fox, Thomas F. Wilson, Mary Steenburgen, Robert Zemeckis, Mary Kay Bergman, Ray Saniger, Dirty Denny, Neil Canton, Christopher Lloyd
It's a documentary and comedy movie, and has a rating of 6.4 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Germany.