The UK show "Lovejoy" based on John Grant's novels is also related. Many episodes revolve around art fakes, and people's feelings towards owning, producing or selling them. It's a great watch with lovely romanticized countryside vistas and Ian McShane as the lead.

one of my favorite films by him. the candid nature of this in comparison to his other work along with the editing style always stood put. you get a much more personal look into Orson's mind as you watch him cut from the editing room narration to a party he's laughing and joking at, seemingly for no other reason than him having fun while realizing he's seeing small details slip that the subjects would normally not share

It's about Elmyr De Hory isn't it? One of my favourite movies.