Oswalt Kolle stated that it was Lawyer Ascher's idea to use Jazz music in the movie The Miracle of Love (1968) to avoid male shoots in the audience. In real life it was not an idea of a lawyer but of Kolle's scientific adviser Prof. Dr. Dr. Hans Giese.
Oswalt Kolle's younger son Stefan was around 3 years old when the movie The Miracle of Love (1968) was released. The actor in the movie is clearly portraying him older.
At several occasions, set in the late 60s, Oswalt Kolle says that he doesn't like parties and uses, in the original German version of the movie, the English word "party", as a synonym for "celebration". This anglicism did not enter the German language until the late 80s. Instead German words like "Fete" or "Feier" would have been used instead, which however has the same meaning in English. However the word was used in Kolle's 1968-movie The Miracle of Love (1968) so it is very likely that Kolle used that term in his private life.
At one moment Moritz was telling his father about the scene in his movie where a supposed party looked unrealistic. However The Miracle of Love (1968) didn't have such a scene. There was a scene where a party was mentioned but it didn't take place there or near a house with a party. The movie Sexual Partnership (1968) had a scene with a party but it is quiet the opposite of what Moritz described (it had many people and music in it).