Location Filming
Two notable shots are actually filmed in New Orleans: the opening shot of the New Orleans International Airport main terminal building; and an open air shot of Peter McDermott and Jeanne at the French Quarter restaurant, Pat O'Brien's. However, the other shots are obviously filmed on Warner's back lot, most especially the outside scene between the Duchess and House Detective Dupere (Richard Conte).
Read more about this topic: Hotel (1967 film)