When Carlos goes to visit Doc he mentions Doc's deceased wife, and calls her Linda. In earlier seasons however, she was referred to as Debra.
When the second fireman climbs the ladder to help save Cruz, Brendan Finney in the uniform can be seen among cops gathered on the street. Oddly strange considering he was sitting on a hospital bed wearing scrubs what seems like only 15 minutes earlier.
After the precinct was under attack and there were multiple explosions, gunshots and fires, no reporters showed up.