Not for nothing, but as a person that was in the neighborhood during the
real "Dog Day Afternoon" bank robbery hostage crisis, in Brooklyn in the early 70's, I was "embarrased" by the shots of crowds cheering Pacino's character on in the film.
This did not happen, at least not when I was there. The area was cordoned off for many blocks, so we couldn't even get close. Believe me, that neighborhood, which borders Bensonhurst, was not sympathetic to armed, degenerate bank robbers holding hostages and making demands.
The movie was shot at a bank in Park Slope, Brooklyn - several miles away from the original scene, and with different demographics as well.