Growth Spurts on Set
Little Gretl, played by Kym Karath, put on a bit of weight during filming. She was growing and maturing to the point that it was hard to carry her around by the end of the film! Karath didn’t appear in the final scene because Christopher Plummer asked for a lighter stunt double to carry on his back.
Source: YouTube
Karath wasn’t the only one experiencing some bodily changes. Christopher also put on a few pounds. He drank and ate a lot on set, and his outfits had to be adjusted to accommodate his fluctuating waistline!