"We were also hampered by budget constraints and cutbacks in all departments. Cannon Films had nearly thirty projects in the works at the time, and Superman IV received no special consideration. For example, Konner and Rosenthal wrote a scene in which Superman lands on 42nd Street and walks down the double yellow lines to the United Nations, where he gives a speech. If that had been a scene in Superman I, we would actually have shot it on 42nd Street. Richard Donner would have choreographed hundreds of pedestrians and vehicles and cut to people gawking out of office windows at the sight of Superman walking down the street like the Pied Piper. Instead, we had to shoot at an industrial park in England in the rain with about a hundred extras, not a car in sight, and a dozen pigeons thrown in for atmosphere. Even if the story had been brilliant, I don't think that we could ever have lived up to the audience's expectations with this approach."
January 1, 1970
https://en.wikiquote.org/wiki/Superman_IV%3A_The_Quest_for_Peace