The movie was shot entirely in London - despite being set in New York. The directors and star, Mark Jax, fly to New York for a weekend after production to shoot the cab journey and NYC exteriors you see in the finished film.
The role of the Landlady (Jane Rawlins) had already been cast when the Producers managed (somehow) to secure the services of Eartha Kitt for one day of work. Rather than fire the person already cast, the Directors had her stand beside Eartha Kitt during her scenes.