Plot hole: Someone entered Erin and Nicky's apartment, moved furniture, and disturbed photos. In the morning, Nicky is leaving the apartment to go to school, and she just opens the door without unlocking any of the locks or removing the door chain. It's NYC, and their apartment door isn't secured during the night or day, and ADA Erin Reagan doesn't think to question why the door is unlocked. (00:00:37)

Blue Bloods (2010)
1 plot hole in season 5 - chronological order
Starring: Tom Selleck, Bridget Moynahan, Donnie Wahlberg, Len Cariou, Will Estes
Friends in High Places - S10-E8
Factual error: Police Officer Troy was taken into a room by Sgt Regan to be interviewed. He has one Sgt stripe on one sleeve. He's a police officer, not a Sgt.
Frank Reagan: I'm the PC. I know everything.
Question: Why why does Danny always yell, "hey!" When he's is a half a block from the perpetrators which gives the perpetrators 1/2 block head start running from Danny. Why doesn't he wait until he's close to him and he wouldn't have to chase him so far?
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Answer: It's a common cop show plot device. If the police on the show always acted in the most logical way (i.e. not alerting a suspect to their presence) the show wouldn't have the opportunity for an exciting foot chase.