When the Mustang is trying run over Mac and Enright in the garage the front end damage switches from the most damaged at the start, to no damage, back to some damage which is less then the first hit.
The Mustang trying to run down Mac and Enright in the garage is a 1967 model at the beginning of the scene and sustains serious damage to the driver's side fender. Enright gets a shot off and the Mustang changes to a 1965 model that has a slightly bent front bumper.
The person who pushes Mac down the stairs is obviously a stunt man bearing no resemblance to either of the two possible intruders.
At 14:30 the intruder goes up the carpeted stairs in the McMillan home. The problem is footfalls have been added to the sound as if the person is walking on the uncarpeted floor. There should be virtually no sound of footfalls on the stairs.