In Spell of the Unknown we are told that Molly's mother disappeared some time before the film. At the end of the film, Spencer appears with a woman who has a similar sort of hat to what Molly's mother has in the photograph.
After seeing them, we see Molly mouth something (sorta looks like Mama) and rush into the woman's arms. Given how much Molly loves her mother he can probably assume this is her actual mother and not some woman who would become Molly's step-mother.
But then what happened to Molly's mother that would cause her to disappear before the film, and then all of a sudden be found at the end?
