Footage from this movie was stolen and they had to do massive reshoots.
Unlike many Neil Simon efforts, which were written as plays then adapted into film, Simon originally wrote this directly for the screen when he realized that a play would have difficulty portraying the many different locations involved.
Writer Neil Simon originally intended "The Out of Towners" to be a segment of the play of Plaza Suite (1971). It was entitled "Visitor from Toledo" and was intended to open the play on Broadway but was cut during the rehearsal period. Simon once described the one-act to the 'Newark Evening News' as being "...about a man who came to New York from out of town and lost his luggage. He got there in the middle of a transit strike. It was snowing. So after he had checked into the Plaza [Hotel] he had this monologue. We put 'Plaza Suite' into rehearsal, and after about the fifth day [the director] 'Mike Nichols' said 'We just have too much show here. If we include that monologue, the curtain will be coming down at midnight'".
The filming location where Steve Martin and Goldie Hawn went for Steve Martin's interview was filmed at the WTC--on the 90th floor was the locating of Dun & Bradstreet. On 9/11; it was the first of the famous Twin Towers to be struck by highjacked AA Flight 11.