When Brian and Gary are looking at the Map on the hood of Gary's car Brian's hand position on the flashlight changes when the camera focuses on Gary, then focuses on him. This was because the flashlight was the only way to light the scene as shot and the map was used as a bounce card to reflect the light onto the actor's faces. Hand position change was so the light was properly reflected.
When Actors Michelle Wright and Connor Brandt run from the living room of the house to the kitchen of the house Connor shrinks in size by 4-6 inches. This was because the living room section of the scene had to be re-shot.
#11 baseball Jersey wearing zombie appears inside the shelter attacking humans and outside the shelter at the same time.
When actor Brian wright gets out of the car to inspect the traffic jam in the wideshot he looks up the road in the direction he came from and his lips move but no audio is heard.
During a steadi-cam shot prior to the zombie attack on the traffic jam the camera man is visible in the window of one of the vehicles