The bloodstains shown on the refrigerator at the beginning of the movie are in a completely different location from where they appear when it is later shown whose blood it was and how it got there. In the opening sequence, the stains are on the front of the refrigerator, whereas when they are shown being put on, the streaks go above the top of the door.
In the movie's opening scene, a cat jumps to a windowsill and knocks off a flowerpot, which falls onto the driveway and breaks. Later, when detectives respond to the house and go around back, the pot is back in place. Still later, when the detectives go to "pick George Ord up" and find the officer on stakeout knocked over the head, the flower pot is again missing.
When Lt. Dan and Sgt. Charles are driving to the house, they are seen in the front seat about 6-12 inches apart between shoulders. When the car pulls up at the house, they are seen to be sitting on opposite sides of the car about 3-4 feet apart.
When the detectives August and Wilentz go to the Ord house to meet up with George Ord they park their car at the curb. Later a patrol car arrives with George Ord and it stops at the same spot where the detectives parked their car but it is nowhere to be seen.
Early in the film, they say the family car is a1962 Ford sedan. It is actually a 1961 model.