Trivia / The Flash 2014 S5E8 "What's Past Is Prologue"

• Directed by Cast Member: Tom Cavanagh directs this very special episode.
• 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".
• Rewatch Bonus: Barry and Nora's scenes with Season One-era Eobard Thawne after the reveals of the Season Finale. You can see now the moment where Thawne realizes Nora didn't come up with the plan and that it's actually his future self sending him a message through Nora and the beginnings of the Stable Time Loop built around Cicada's Dagger).
• What Could Have Been: Rick Cosnett was originally going to return as Eddie l for this episode, but Todd Helbing hinted that scheduling conflicts prevented Cosnett from reprising the role. Helberg also hinted that potential scheduling conflicts similarly prevented the crew from having more scenes of Teddy Sears as Zoom or bringing back Tom Felton and Shantel VanSanten as Julian and Patty respectively.