when people see a jaywalker or other likely looking pedestrian and shout 'two points!' or something similar, they're making a reference (whether or not they're aware of it) to this movie.

the real point system goes something like this:
women are worth an additional 10 points. (thanks to tyrael for the correction)
teenagers are worth 40 points.
kids under 12 are worth 75 points (atomic pop says 70).
seniors over 75 are worth 100 points.

sources: ohthehumanity.com and atomicpop.com