Deliberate mistake: The opening camera scene, that's supposed to be shot from Michael's POV as a child, is too high as noted that he's almost face to face with his parents at the end of the scene and then is only mid-chest up to the father when he removes the mask. The POV is also too high as he walks across the dining room and as he approaches his sister upstairs.
Deliberate mistake: In the first scene of the movie, we soon realize that we are looking at a house from someone's point of view who has no trouble looking over a porch railing, about 6 feet above the ground. It's revealed later that he is a little kid, about 4 feet tall. John Carpenter deliberately filmed it that way to exaggerate the impact of his little kid killer reveal. Unfortunately, when the kid is standing outside the house with his parents, you can see he could never have looked over the porch railing.
Answer: Even though it was thought that Michael Myers had a deformed left eye, it is supposed to be the result of the injury that Laurie Strode (Jamie Lee Curtis) inflicted when she stabbed him in the eye with a clothes hanger. The look was achieved by a prosthetic that was stretched to give the eye a droopy-like appearance. You can see a similar prosthetic in a brightened up version of the Halloween 2018 poster.
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