When Danny tests Steve's cognitive functions by asking how long they've known each other, Steve answers fifty years, as a joke. The original Hawaii 5-O premiered in 1968, fifty years before this episode.
This is the second time that the show has remade a story from the original Five-O. The first time was with the remake of Hookman (1973) in season three.
Is a remake of the original Hawaii Five O pilot, also called 'Cocoon,' which premiered fifty years prior.
This episode uses a similar font style as the classic 1968 series
Scott Caan has voluntary decided to have less screen-time this season, so that he could spend time with his family in Los Angeles.