Actress Jill Townsend (who was married to actor Nicol Williamson at the time of filming) began an affair with co star Alan price during production. She divorced Nicol Williamson a year later & eventually also split from Alan Price.
Alfie (being only a member of the public) would never have been allowed on a UK plane crash site in the final scene due to it being a barred area, strict security & under police investigation.
The UK cinema version was cut by the BBFC to replace one use of the word 'cunt' with 'fool'. All subsequent releases have featured the cut version.