Susan Sarandon gave pictures of herself in the 1970s to British artist Russell Oxley, who used them to paint an acrylic portrait of her character, supposedly from that era. After filming, the canvas went home with Sarandon.
According to director Charles Shyer, in the shot where Alfie (Jude Law) punches a car windshield, Law actually cracked the windshield. Apparently, the actor wasn't able to put as much effort into punching it until Shyer told him to imagine that it was the paparazzi. As a result, Law punched so hard that a sledgehammer had to destroy the cracked windshield.
When Nikki is painting Alfie's Apartment, she approaches Alfie holding a cigarette. When she's going to touch Alfie with her painted hands, she has the cigarette in her mouth. Then the angle changes and she has it again in her hands.
Right after the flower shop scene, Alfie rides his scooter to Liz's place. Only the flowers are not in the basket or anywhere on the scooter. Yet as he comes around the corner of the stairs towards the apartment, he has the flowers in his hand.
Alfie: It seems to me the problems you worry yourself sick about never seem to materialize. It's the ones that catch you unexpectedly on a Wednesday afternoon that knock you sideways.
Alfie: [to the viewer]
I told you how we men are. We want showstoppers. And the problem is, Julie hasn't got enough of the superficial things that really matter.