After the mother is stabbed, the killer's knife is again clean of any blood.
After John has been cut several times, the blade is next shown clean.
The blood splatter as Traci is attacked is inconsistent to how she is cut and stabbed.
When the killer is on top of her in the car and she stabs him repeatedly, no blood can be seen from his neck, though her face is covered in his blood.
After the mother is stabbed while on the phone with 911, the 911 operator's voice trails off and police are never dispatched, which would not happen.
When the killer standing over her misses stabbing her with garden shears, he oddly drops the shears in favour of chocking her.
After the mother is stabbed with the knife, the killer for some reason finishes her off with scissors, when he still had the knife after initially stabbing her.