A Single Man (2009) written, produced and directed by Tom Ford
“India”, the dog that George sees in the car, belongs to Tom Ford.
The glass-and-wood home that George and Jim shared is a real house in Glendale, California: The Schaffer Residence, built in 1949 by the mid-century Modernist architect John Lautner (1911-1994).
Colin Firth’s character George mentions in a conversation with Nicholas Hoult that he once took mescaline and ended up shaving off one of his eyebrows. This actually happened to director Tom Ford; he was taking the drug with Stephen Spender when he went home, looked in the mirror and “thought it was taking over [his] face”.