When Zeke takes Terry's sandwich away it is whole. When the scene cuts to him taking a bite out of it just a second later, it has already been bitten multiple times.
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.
When the squad are throwing things at Jake in front of the elevator, 'Rosa's' leather jacket flicks up and you can spot Stephanie Beatriz's mic pack tucked in the back of her pants.
When Jake is talking to Captain Holt about the individuals stuck in the office, he tells Holt there are 6 lawyers. When it pans to the lawyers there are clearly 7 people visible.