Goofs

As the woman with the scarf on her head first walks into Central Park the heels on her shoes are a thick, low to mid height style but as she continues to walk through the park the heels on her shoes change to a higher, thinner style heel.

Roy Scheider wears glasses that are props, with plain glass. This is evident by the fact that they reflect light evenly, whereas prescription glasses would be curved and therefore would not reflect light evenly.

Some night scenes were filmed using a filter to darken the scene. But this technique merely darkens the green the of the trees and of the bushes. However, in reality, at night time, the trees and bushes themselves will actually disappear into the darkness of the night.