Well, you can’t marry someone when you’re in love with someone else… can you?
Kym Karath (Gretl) couldn’t swim, so the original idea was to get Julie Andrews to catch her when the boat tips up and they all fall in the water. However, during the second take the boat toppled over so that Andrews fell to one side and Karath fell to the other. Heather Menzies-Urich (Louisa) had to save her instead. Andrews stated later she felt guilty about this for years.