Trivia: The security guard who gives "mother" a blanket at the end of the movie has the door opened for him by a young Ted Knight.
Trivia: The sound of the knife stabbing Marion's flesh in the shower scene was made by stabbing a melon.
Trivia: A body-double was used in the shower scene when anything else besides Janet Leigh's face, neck, shoulders, and arms are seen on screen.
Trivia: That freaky, shrill score of Psycho, created by Bernard Herrmann, inspired a well-known music producer to help create a popular song for a famous band. George Martin cites Bernard's score as an influence for 'Eleanor Rigby' by the greatest and most romantic band ever, the Beatles.
Trivia: Director Hitchcock hid the model of Mother in Janet Leigh's bedroom and listened to how loudly she screamed when she saw it to test its effectiveness.
Trivia: Walt Disney hated the film so much that he refused to allow Alfred Hitchcock to film at Disneyland for another film he directed.
Trivia: The CHP didn't use Fords in 1959 or 1960.
Chosen answer: Birds are just a favourite choice of spooky animal that Alfred Hitchcock seems to use hence the film "The Birds". Eyes show the window to our soul where our deepest fears originate and who isn't scared of getting knifed in the shower. The mirrors i can't explain but I can suggest that it just looks creepy.