I watched Back to the Future last night, for the first time in years, and I noticed something that I had never taken note of before. The nature of Marty's injury from being hit by a car is inconsistent.
As far as I was able to tell, he pushes his father out of the way, then turns to face the oncoming car. He puts his hands out to protect himself, the car stops short. Marty takes the full force of the impact in his hands and arms, and he is thrown back, falling backwards, and hitting the back of his head on the asphalt.
Later, he wakes up to find his incredibly hot mother applying a cold compress to his forehead. He realizes he is still in 1955, sits up, and his mother repeatedly mentions the bruise on his forehead, and tries to touch it. She focuses exclusively on his forehead, not the back of his head.
As far as I was able to determine, his forehead never suffered any injury - the car hit his hands (and possibly his knees), and the back of his head hit the pavement. Nothing seems to have hit his forehead at all.
Here is the scene I'm talking about - the car hits Marty at about 50 seconds in:
Is this an inconsistency, or am I missing something? Did Marty hurt his forehead, and if so, how?