The federal Volstead Act did not prohibit drinking alcohol. It prohibited manufacture, sale, transport, distribution and import/export.
It was left to the states to make laws to prohibit possession and consumption. All the states did, but Nevada's was repealed on state constitutional grounds.
The September 3, 1969, issue of VARIETY reports that Claude Johnson took over the small role of "young man" from actor Ted Barnum (credited as Charles Akins) when Barnum declined to do the nudity required for the role.
Location scenes filmed in Stockton, California.
Elmore Leonard said that one day while he was on set watching a scene being shot, Patrick McGoohan came up to him and said "What's it like to stand there and hear your dialogue all fucked up?"