Throughout the entire movie, Tippi Hedron is driving around in this 2 seater car. When she pulls up to the school teachers house in the beginning, the camera clearly shows only 2 seats, no backseat and 2 in the front with a shifter on the floor. However, at various times, we see a backseat. When Cathy is picked up by Mitch and Tippi at the dead school teacher's house, she sits in the front with them. How is that possible with only 2 seats. At the very end, they ALL pile in the car with Tippi and Lydia, the mother sitting in...a backseat!!

A strange and very obvious slip-up for Alfred Hitchcock to miss!