Several well-known actors (including Richard Harris, Laurence Harvey, James Booth and Anthony Newley) turned down the title role due to the then taboo subject matter of abortion. Despite having played "Alfie" on Broadway, Terence Stamp categorically declined to reprise the role on film, thus giving his good friend and then roommate Michael Caine the breakthrough role of his career.
We see a streetsign showing that Alfie's flat is in Chepstow Road, W3. Later in the film he goes for a walk with his neighbour leaving Lilly in the flat. They are seen walking in the area behind King's Cross station, several miles from W3.
Alfie's seduction of Lilly takes place in midsummer. The next time we see her we are told that three months have elapsed, but the foliage still shows it to be midsummer.
Alfie: She's got a little ginger moustache. But I find I'm quite willing to overlook the odd blemish in a woman, providing she's got something to make up for it. Well, that's what we're all here for, innit - to help each other out in this life.