The end credits just list peoples' names, without any indication of what work they contributed to the project.
Director Jean-Luc Godard never won any award at the Cannes Film Festival until he presented this film in its 67th edition, where he won the Jury prize (shared with Mommy (2014)).
The film's title never appears on screen.
The film's title has a double meaning. In Vaud, the French-speaking part of Switzerland where Godard was raised and currently lives, the word "adieu" can mean both goodbye and hello.
In the film, a character says that Hitler was democratically elected. However, another character disputes the statement, saying 'I have doubts'. So, it cannot be said that there is an error regarding this subject at any point in the film.