Adrienne Posta replaced Una Stubbs as Rita, and Paul Angelis replaced Anthony Booth as Mike for the film. Both original actors continued to play their rôles in the parent BBC series, with Posta later guesting in Party Night (1974).
Alf references Bobby Moore's alleged (and ultimately dismissed) theft of a bracelet from a jeweller in Bogotá, Colombia in the lead-up to the 1970 World Cup, which saw the England captain detained for four days.
At the match, Alf shouts to Reg Pratt in the executive box, West Ham United's chairman from 1950 to 1979.
The Garnetts (at 35) and the Frewins have top floor flats in the fifteen-storey John Walsh Tower block.
The pub Alf falls into is The Three Suns on Garnet Street in Wapping. This was the street which inspired the character's surname.