Reese calls Finch on the bad guy's cell phone to tell him where to send Carter. When Finch hangs up, Reese hears a dial tone on the cell phone. There is no dial tone on cell phones. This is an error that occurs many times throughout this series.
When Carter gives the mobster the cup of coffee in the interrogation room, it's obviously empty, as it makes a hollow click as it hits the table.
When Finch enters the car after punching numbers on the ATM, he enters on the right side before driving off.
When Finch pretends to be Detective Fusco to Vehicle Recovery Services, he says the report number is "Lima 3-7-7." NYPD uses the phonetic "Lincoln" for the letter "L."