Rip Hunter is identified by Eobard Thawne as the creator of the first successful time machine. He has been identified as a member of the time masters and will appear on DC's DC's Legends of Tomorrow (2016).
Martin Stein says that he feels like he should say something like Eureka or Excelsior, referencing the popular phrase said by Stan Lee.
Towards the end, the woman seen after Captain Cold is Hawkgirl/Kendra Saunders.
According to Grant Gustin, this is his favorite episode of the series.
Not only does the opening have a new video montage and slightly modified monologue, the lightning flash through the series icon is reversed moving from upper left to lower right.