Stupidity: When she leaves him at home with a sandwich she says people will come check on him. When she gets home and he's not there, she doesn't go and ask those people where he is.

Changeling (2008)
1 stupidity
Directed by: Clint Eastwood
Starring: Angelina Jolie, Colm Feore, Amy Ryan, Gattlin Griffith
Character mistake: When Captain Jones first introduces himself to Christine Collins he says he is from the Lincoln Park Juvenile Division instead of Lincoln Heights.
Christine Collins: The boy they brought back is not my son.
Question: Warning: Spoiler. At the end of the movie, it's found that three of the victims had managed to escape; only one was actually returned to the parents. It isn't known if the other two were recaptured by the killer or managed to get away (but went into hiding). Why didn't the police just go back and question the killer's accomplice? He'd likely be able to reveal whether any of the boys had been recaptured. (We're never told if the accomplice had died by that point, or whether he was unavailable, or whether nobody bothered asking him.)
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Answer: When the accomplice is originally questioned he says that killer told him a few 'may have escaped', implying he never knew if they were caught.
Also, it's implied his accomplice a young boy himself was scared of ending up like the boys himself, sadly I think it was done for survival.