The opening shot of the outside of Felix's photo studio is of 247 E 60th Street in Manhattan. His studio is located between Serendipity III, a restaurant featured in several movies, and Pottery Barn. In 2022, a home lighting store occupies the address.
In the opening shot, the viewer gets a clear view of the door to Felix's studio, which says "Felix Unger Photographer...F.U. Enterprises." The entire series would have many of these subtle risque jokes hidden in plain sight.