Sacha Baron Cohen was originally going to play Sir Richard McCreadie but dropped out. After Steve Coogan was cast in the lead Isla Fisher was cast as Sir Richard McCreadie's ex-wife and she is married to Sacha Baron Cohen in real life.
Steve Coogan stated he based his performance on Philip Green, but his look (especially the very white teeth) on Richard Caring. (Tiff premiere Sept 7, 2019).
Despite playing his character's mother, Shirley Henderson is actually one month younger than Steve Coogan. She played his character's wife in 24 Hour Party People (2002).
Greed marks the 7th collaboration between Steve Coogan and director Michael Winterbottom: Greed (2019), The Trip to Spain (2017), The Trip to Italy (2014), The Look of Love (2013), The Trip (2010), Tristram Shandy (2005), 24 Hour Party People (2002).
Sir Stephen Fry (as himself) is a guest at the party which has an Ancient Greek theme. In real life, Fry is an expert on Greek mythology, having written two books on the subject: Mythos and Heroes.