- Directed by Cast Member: Tom Cavanagh directs this very special episode.
- I Knew It!: Many fans had already predicted that Thawne would be the one who sent Nora into the past.
- Jossed: There had been a popular theory floating around that "Nora" was actually Eobard Thawne in disguise. This episode seems to firmly shoot down the idea, as it's instead revealed that Nora really is Nora, but she's being manipulated by Thawne.
- Meaningful Release Date: Quite appropriately, this Milestone Celebration aired exactly five years after Barry Allen's debut in the Arrowverse.
- Milestone Celebration: This is the show's 100th episode, hence all the nods to the show's past, much like Arrow's 100th episode, "Invasion".
Trivia / The Flash 2014 S 5 E 8 Whats Past Is Prologue