Frankie's Dad is seen wearing a down vest in several scenes in the film, but this would not have been the case in 1962. The schoolbus that appears in the film is also a much later model.
Toward the beginning of the movie, Frankie falls into wet cement on a sidewalk. He would have needed to hose down himself and his bicycle in order to get the cement off and stop it from hardening into chunks and totally screwing up his bicycle and clothes. In the next scene, it looks like he was just rolling around in plain old mud that he brushed off.
During the movie when we see Melissa's ghost, she is able to go through objects, like doors and windows, without having to open them. When we first see the Lady in White ghost come out of her house and start running for the cliffs to look for Melissa, she opens the gate to the white picket fence surrounding the house. She shouldn't have needed to open the gate.
In the opening scene when the boys are going to school they ride their bikes for a ways and when they are following Melissa they go right outside of their house and across the street to the school.
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