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
El milagro del amor (1968) so it is very likely that Kolle used that term in his private life.
