When the reporter is interviewing Mayor Edward Koch, there is no prop camera in the scene even though the interview is right outside the studio for the TV show "Good Day New York." At the end of the scene, the reporter accidentally looks directly into the lens of the camera used for filming the movie instead.
When Philip is having a key made, the guy making the key holds it against a grinding wheel and then another wheel with wire bristles, used to finish making a key. During all of this, and when he stamps the key with info, it's apparent that there are no actual cuts in the key. It's still a key-blank he's about to hand to Philip.