Continuity mistake: When Frank picks Rita up from the railway station, it is a cloudy day. As they drive away, it has suddenly become a very clear sunny afternoon. Furthermore, their places in the car have been taken by stunt doubles, with Michael Caine's stand-in sporting noticeably longer, darker and thicker hair. (01:02:35)
Rita's Father: Say, Denny. Denny, I'm sorry for you, lad. If she was a wife of mine I'd drown her.
Rita: If I was a wife of yours I'd drown meself.
Dr. Frank Bryant: Found a culture, have you Rita? Found a better song to sing? No, you found a different song to sing, and on your lips it's shrill and hollow and tuneless.
Rita: Christ! My customer! She only come in for a demi-wave, she'll come out looking like a flippin' muppet.