After a wife tries to kill both her husband and herself in their car, he asks her why does she want to commit suicide. In that shot there is no river behind him, but in the previous shots there was.
When brother leaves from a visit to his sister, he goes off screen and almost instantly a motor is heard and she watches him leave. He wouldn't have time to turn on the car in that short amount of time, yet alone leave.
Ruth wakes up, finds a knife-wielding stranger. all in black. standing in her room, poised to kill her. She doesn't scream or even make any sound, just struggles silently as he strangles her to death.