Other mistake: When Leon enters the apartment building in the first shots he, needs to go up the stairwell in order to get to his apartment. But in the scene when Mathilda enters the building (after getting groceries while her parents got shot), she's right on the apartment floor without having to use the stairwell in the first place. (00:20:00 - 00:30:00)
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Suggested correction: There's no mistake at all. Mathilda leaves the grocery store at 30m21s. Then the scene cuts to her coming out of the elevator opposite the staircase at 30m33s. We don't see her walking up the stairs because she didn't use them.
