After the group finds the scarecrow, a crew member's white pick up truck is seen behind the lead girl.
When Mark's head is on the serving platter, his eyes are moving and blinking.
When the hitchhiker opens the car door and gets in, two crew members are seen reflected in the car window.
Several times during the first scenes in the car, the crew member's hand holding the camera can be seen on the left side of the screen.