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In the scene where JJ and Emily are talking about bureaucratic red tape, they are seen entering the Bernero Brothers building.
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When Keri and Ryan opted to "pretend" there was no crazy man, they hear their dog barking and found him out the gate, which could only be opened from the inside, was open and the dog was gone. A few scenes later, Ryan sees the man walking his dog, who had just parked his car, and there was no gate or fence. Keri even looked out the window before she was abducted.
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JJ refers to a letter that Keri Derzmond wrote to the Silver Spring Police. Silver Spring, Maryland, is an unincorporated part of the county and doesn't have its own police department. There is a Silver Spring office of the Montgomery County Police Department, which is where Keri Derzmond would have contacted.
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It is revealed in this episode that Rossi has been married three times.
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The dry-cleaning store in the opening had bars on the window when viewed from the outside and no people waiting at the counter. In the interior shot, the windows had no bars, they had doubled in size, and there was now a line of people out the door.