The actress playing Golda Meir speaks English with a very thick German accent. The real Golda Meir grew up in Milwaukee, Wisconsin, and spoke English with a standard American accent.
During the climactic shootout, one of the actors playing a dead terrorist, shot between the eyes no less, visibly flinches when Franco Nero fires his machine gun next to him.
William Holden, playing the police chief of Munich, Germany, speaks in his normal, American accent, whereas all of the other actors, including native English speakers, speak in "accented" English, according to the nationality of their characters.