This was a dedication to the Black Canary and Sarah Lance with a lot of emotional moments and flashbacks from the time Oliver left after Tommy’s death going to the island again.
They also used this as an opportunity to make fun of their Lazareus Pit in an indirect way as Quentin (father) was trying his best to revive his daughter. What actually was surprising was the fact that they revealed about her being the Black Canary.
And more surprisingly was how the mayor was attacked by Diggle and she even dared to tell her team to capture Oliver as the Arrow while he was there trying to save her life.
Overall just an episode to show the emotional consequences of the team and bringing Felicity back on board.