A UPI news item dated July 3, 1960 reports that while preparing to film a scene on a boat, Lucille Ball fell, struck her head and was knocked unconscious. She was taken to Cedars of Lebanon Hospital for a possible concussion and severe face and leg bruises. Her ex-husband Desi Arnaz rushed to the hospital from his ranch at Corona to be with her. Fortunately, preliminary x-rays of the head, neck and spine showed that the beloved star was not seriously hurt. Bob Hope was quoted in a New York Times article, "This film should have been shot at Cedars of Lebanon Hospital".
The United Airlines plane at the beginning of the film is a 1953 Convair 340-31, registration N73138. It flew with United until 1961, then Lake Central Airlines until 1967. It was then with Allegheny Airlines from 1968 to 1976. After that it was exported to Canada, returned to the US in 1993 and apparently scrapped at Roswell, New Mexico c. 2002.
The injury to Lucille Ball was not the only problem to afflict the picture. Don DeFore injured his back, requiring hospitalization, and director Melvin Frank broke his ankle playing golf and had to hobble around on crutches. The film's publicist came down with a two-week case of the mumps, Bob Hope smashed his finger, and even the delivery man from Lucy's pharmacy fell into the same tank that the star had. To top things off, a few days after Lucy referred to her Desilu soundstage as a "firetrap," it partially burned down.
When Bob Hope's character, Larry, is asked what color he wants a faded shirt dyed, he responds "surprise me." When Bob Hope was dying, he was asked about burial plans and responded "surprise me."