The camera is always moving (if only slightly) in every shot as requested by producer and director Robert Altman.
Downton Abbey (2010), written and created by Julian Fellowes, originally was planned as a spin-off of this movie; instead, it was developed as a stand-alone property inspired by the movie, set several decades earlier.
None of the actors and actresses who played servants wore any movie makeup, although they did wear conventional makeup like lipstick.
In the DVD commentary, producer and director Robert Altman stated he included the "f" word several times on purpose to get an R-rating because he didn't want kids to see this movie. He thought kids wouldn't like the movie, so he wanted to keep them out (especially fourteen-year-old boys).
In the documentary Altman (2014), it is stated that Robert Altman was unable to fund this movie, even with most major stars not being paid and lining up to work with him. Eventually, he said he won the lottery when the British Lottery funded this movie.
Robert Altman: [dialogue overlap] Rather than just use a typical boom mike to pick up dialogue, Altman had all of the actors and actresses wear portable microphones to assist in creating overlapping dialogue. He first developed this technique during Eine Hochzeit (1978), and used it several times.