If the opening credits are watched frame by frame, 2-3 frame bursts are seen that are relevant to the story. These depict the process by which Dr Caldicott performs his operation, including a shot of a slow moving needle and an eye that has been clamped open.
Voices at the end of the credits say Main Commands of Dr. Caldicott's Program: "Let the light get into you... yes, slowly". BETTY CALDICOTT: "Meet the musical little creatures that hide among the flowers". LORNA LONGLEY: "Treat yourself".