For the scene in which Heidi is butted by a goat and falls over, Shirley Temple was butted for the first few takes. Although she later said that being butted was not painful, her mother Gertrude Temple became concerned for her safety and insisted that a stunt double be used.
Marcia Mae Jones was four years older and eighteen inches taller than Shirley Temple when this movie was filmed. Jones later recalled of the scene in which Temple helps her crippled character to walk that if she had really leaned on Temple, she "would have crushed her."
The scene in which Heidi is suddenly squirted in the face while milking a goat was planned without Shirley Temple's knowledge. A tube of milk was attached to the goat udder where Temple couldn't see it, and when she was squirted, her surprised reaction was genuine.
The scene in which Heidi smuggles a litter of kittens into the house, and the following scene in which Sebastian hides the kittens from Heidi's cat-hating aunt, were in the original book; the scene with the capuchin monkey was written for the film.
Because Christian Rub is credited in the opening credits, but NOT in the end credits, the opening credits are listed first and Sig Ruman (the only cast member listed only in the end credits) is listed last.