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.
When Jake tells the story of how he became the tattler the Smash Mouth song All Stars can be heard. However Jake says it happened in 1997 and All Stars didn't come put till 1999.
When Terry, Hitchcock, and Scully are trying to determine the type of crinkle heard on the radio and are balling up foil to try to replicate it, Captain Holt refers to them as wasting "tin." Terry tries to say it was only one piece but admits, "it was a ton of tin." Tin foil hasn't been made since World War 2. Foil available after that is made from aluminum, not tin.