A noteworthy moment occurs when Caroline buys and brings the material home to make a new dress. When Laura reaches out to touch it, Mary slaps her hand hard and says "Don't touch, Laura! You'll get it all grubby!" There was a hard slapping sound when Mary did this, and look closely at Laura's face after she does it. The child looks like she is about to start laughing--and then she looks like she might burst into tears, or even a little embarrassed. But when she says her next line a few seconds later, she sounds perfectly fine. It's a really interesting thing to see. In previous interviews, actress Melissa Gilbert has said that this precise moment defines the unique relationship she had off-screen with Melissa Sue Anderson.