How is paranoia shown in M?

Taking a film class?

I think you answered your own question. Lighting sound etcetera.

I feel that I sympathise with Berkert because of his psychological disturbance but also with Elsie's mum. I beleive Beckert affected society through his violent crimes and therefore leaving a dilemma for the audience members on who to sympathise with the most.

Through its cinematography - most notably the image contrast and camera position