Leslie Phillips spoke out against this film after is was released, as he said it had been completely changed from the story he and the other elderly actors were making about an old people's home, in order to concentrate on the relationship between Michael Caine and the boy.
Some think the father's mustache at the party is a continuity error as he shaved it off that morning. However, it is a fancy dress party and the father is clearly wearing a fake mustache to go with his costume.