Jake is attempting to choose between different shades of beige napkins. Many of the examples are clearly gray, white, and/or brown.
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.
Santiago is wearing 2 citation bars that are not issued by the NYPD. Also, NYPD regulations require that the American Flag bar be worn as the highest citation bar - something Santiago would have known.
Many of the awards worn by Capt. Crawford above her badge, are not actual commendation bars awarded by the NYPD.
When Amy leaps off the balcony at the nursing home, she falls much too slowly. She was clearly filmed separately and inserted into the shot in post.
Amy leaps off a second-story balcony and lands in a patch of mulch, yet her white and light pink nurse's uniform is completely clean.
A car window would not shatter from having a rock thrown at it the way it is shown to here when Jake breaks the windows of Terry's van.
When Amy leaps off the balcony yelling, "You're mine, Sergio," her lips don't move.
Many of the tasks Jake has to complete for the wedding are the sorts of things that would be decided on months in advance. Someone as fastidious as Amy would not wait until the last minute and many of the things would require much more lead time.
Jake has worked at the 9-9 as long as Rosa and longer than Amy. There is no way he wouldn't know about a case as large as Mindar.
At the end, immediately following the suspect being hit with a crutch, you can see Stephanie Beatriz roll her left ankle as she enters the shot. In the following 2nd angle shot you can clearly see the look of "amused pain" (complete with tongue-in-cheek), followed by a limp down the steps.