Continuity mistake: At the start of the episode, when Frank opens/closes the refrigerator door we see the door's layout, and the door bin cover is under the top shelf compartment. As he makes himself the sandwich Erin and Nicky walk in, and when Nicky opens the fridge door it's an entirely different interior style with the door bin cover at the top.

Blue Bloods (2010)
1 continuity mistake in Higher Education
Starring: Tom Selleck, Bridget Moynahan, Donnie Wahlberg, Len Cariou, Will Estes

The Uniform - S2-E11
Character mistake: While handcuffing an auxiliary officer in his apartment, there is a poster on the wall reading, "attention military personal..." Personal is misused. It should read "attention military personnel." (00:16:02)
Frank Reagan: I'm the PC. I know everything.
Trivia: Although Len Cariou plays Tom Selleck's father, he's only five years older than Selleck.
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.