When Sam stops Molly in the street, there is first one shot of him without glasses and then in the counter shot we see him wearing glasses.
On the last day of shooting, before completing the project, night fell when there was only one scene left to shoot, a scene which incidentally took place outside, and to make matters worse there was no time left to wait for sunrise. There they were near the entrance to the bridge on Roosevelt Island with the only lights being the ones which shone from the Manhattan skyscrapers. Nonetheless, the fact that the same scene had been shot simultaneously both in 16mm and in Mini DV allowed to have (in so far as the scenes shot in digital were concerned) a near perfect illumination and therefore a scene worth including in the final cut.