The Secret Garden (1949)

Continuity mistake: In the scene where Mary is eating her oatmeal while Martha is talking to her, take a look at Martha. While talking to Mary she spits out a piece of bread she was eating and this causes the little girl who plays Mary to momentarily slip out of character and smile (almost ready to laugh).

Continuity mistake: When Mary leaves the house to play in the garden, her hair is untied. However, a few shots later we see her exploring the grounds of the house, and her hair is now in pigtails.

Continuity mistake: When we first see the lock to the secret garden the keyhole is to the right of the handle, but later the keyhole is to the left of the handle.

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Colin Craven: You don't even care how I won't live to grow up.
Mary Lennox: Stop it. You'll live as long as I will. You just say that to make people feel sorry for you and do what you say.
Colin Craven: Don't you dare say that! Don't you dare say how I won't die.
Mary Lennox: Why, you're proud of it. It makes you feel important.

Dickon: And Ben said he loved her, and I said, what of that? Is loving someone a reason to kill? And Ben said, how old are thee?
Colin Craven: My father must've loved my mother very much.
Mary Lennox: I suppose we're not old enough. There must be an awful lot we don't know. I don't want to grow up.

Mary Lennox: What's that?
Dickon: A fox cub. His name's Captain.
Mary Lennox: Dickon, are you still angry with me?
Dickon: When was I ever angry with thee?
Mary Lennox: Oh, good. Dickon, I've got so many secrets I'm just dying.
Dickon: Thou seems most healthy.
Mary Lennox: Dickon, I need you. All you have to do is listen. What good is a secret if there's no-one to tell it to?