1. Shower Scene inPsycho
At the final shot of the shower scene there is an extreme close up on Marrion’s (Janet Leigh) eye and then camera pulls up and out. I had to mention that the shot is interior, in the shower and according to shower scene film sequence Marrion is dead in the shower under while water is dropping to her body.
Obviously there was not enough free space for the camera to move and there was also the water splashing on Marrion’s face. As a result the inability of camera to focus manually and to be moved into the bathroom in relation with Marrion’s difficulty to make the scene because of the water splashing on her face (he wanted to blink her eyes) made the shot very difficult. So, Alfred Hitchcock was forced to do retakes of the final shot of shower scene.
2. The opening scene
According to Alfred Hitchcock there was a problem. In the opening scene (Hotel room in Phoenix) Leigh and Cavin were not passionate enough. There was a luck of eroticism and this fact was unacceptable by Alfred Hitchcock. As a result Alfred Hitchcock changed camera angels and shots to cover the performance of Leigh and Cavin in the beginning scene.
3. The discovery of Bates Mother
The scene is complicated and combines three different actions - (a) the chair turning around, (b) miles hitting the light bulb, (c.) the lens flare and the three actions to be coordinated at the same time.
4. The murder of Arbogast
There was a very big obstacle because the overhead camera angel was necessary to hide the twist ending of Psycho. The Arbogast murdered was shot on a stairway so there was not enough space for any camera movement.
Alfred Hitchcock and his production team was necessary to innovate and find a solution to this huge problem. The solution was the construction of a multipurpose camera track constructed on pulleys alongside the stairway with a small chair like device.