In a flashback to earlier in the day, Rosa is seen tearing through the sliding paper door covering the vending machine in the remodeled break room, but in the scenes set in the "present" the paper door is fully intact.
Captain Holt wears his Commendation breast bar above his World Trade Center Breast Bar. When the WTC bar is worn, it is worn above all other medals, but below the American Flag bar.
In the pre-intro scene, Boyle reacts to Peralta's jacket collar flip a split second before it actually happens.
The person who burgled Laverne's apartment is said to have entered through a broken window, but the hole on the glass is too small for a grown man to have crawled through.
Laverne Holt requests that Jake not inform Raymond that George Kenderson is her lover, not someone who was casing her apartment. Kenderson was already identified by Holt as a suspect. Even if Jake doesn't tell Raymond the nature of their relationship, he would unquestionably discover it very quickly in the course of investigating/interrogating Kenderson.
Boyle suggests an "open concept" for the breakroom remodel. The breakroom is a single, undivided, unobstructed space. It is already open concept.