Re-shoots were required when American test audiences did not like the characters played by Burt Reynolds and Gene Hackman getting killed off in this movie's ending. A happy ending was then filmed requiring the two and Liza Minnelli to come back.
The 'Lucky Lady' boat was a 63 foot racing cutter yacht requiring a crew of eight to sail it. The vessel was originally named 'Orient' and was built in Hong Kong in the mid 1930s, about forty years prior to this picture being made. Apparently, the 'Lucky Lady' was the "star" of a 97 ship rum running armada that operated between Mexico and California, USA.
This movie was germinated when co-screenwriter Gloria Katz saw an article on 1930s rum running in a magazine around the time the finished screenplay for American Graffiti (1973) was been assessed three years before this movie was made, in 1972.