- For the eponymous character, see Nora West-Allen.
After an unexpected guest from the future, Nora West-Allen, appears at their home, Barry and Iris must figure out how to get her back to the future without disrupting the timeline, even more than she already has. Team Flash must work together to send Nora back, while simultaneously fighting off another villainous meta.
- Daniel Cudmore previously played Jackhammer in the Arrow episode "" in addition to providing the motion capture for Grodd in the DC's Legends of Tomorrow episode "".
- Barry suggests that Nora could "Marty McFly herself out of existence", referring to the protagonist of the 1985 film Back to the Future, who travels back in time accidentally interferes with his parents' first meeting, nearly erasing himself from existence.
- While describing the existence of the Multiverse, Ralph makes mention of an Earth without "that last Indiana Jones movie", referencing the 2008 film Indiana Jones and the Kingdom of the Crystal Skull, which was panned by audiences.
- Cisco calls Nora "Billy Pilgrim", telling her that she is no longer "unstuck in time", both references to the Kurt Vonnegut novel Slaughterhouse-Five.
- This episode features many references to older episodes:
- The beginning and the end of the episode, when Nora explains her story, is a reference to the very first scene of "".
- Ralph mentions the possibility of Barry creating a timeline where the former died in the particle accelerator explosion. Before Barry created and undid Flashpoint, Ralph did die in the particle accelerator explosion, as mentioned in the first season episode "".
- Barry teaches Nora to phase, closely quoting what "Harrison Wells" had said to him when teaching Barry to phase in "".
- Iris mentioned the time Barry traveled back in time and recruited Leonard Snart for help in "".
- Ralph mentions the possibility of a world where everyone is evil. This occurred through the events of Crisis on Earth-X. Earth Two, as seen in "", and hinted in "" also fits this description.
- Iris mentioned the time Barry traveled back to 2015 to get help from Eobard Thawne in "".
- Ralph mentioned how Eddie killed himself in "".
- Wally and Nora mention how Wally fought the ghost of Elvis Presley's brother and how he met the actual Elvis Presley in the DC's Legends of Tomorrow episode """.
- Nora mentions the time Barry ran on water to fight King Shark in "".
- The picture Nora was looking at of Team Flash was taken by Barry in "".
- Iris mentions the time Barry tried to save her from getting killed by Savitar, which happened throughout the second half of Season 3.
- Barry states, "Nora shouldn't be here", which is one of the quotes he said after coming out of the Speed Force in "".
- Nora mentions the time Barry used the tachyon prototype and accidentally traveled to Earth Thirty-Eight, where he met Supergirl for the first time in "" (the meeting itself was shown in Supergirl's "").
- Nora mentions a future battle involving King Shark and Grodd. Executive producer Todd Helbing has mentioned the possibility of these two teaming up in the latter half of the season.
- This episode marks the first time in the shared multiverse that a season starts right where the previous season ended, as this episode takes place right after "".
- This is the first episode of The Flash to be named after someone in a civilian sense not being phrasal phrasing before coming to the key word.
- The Flash family phasing the crashing plane through the buildings and into the water is an adaptation of when Barry did the same thing in the third issue of his New 52 comic, with the shot of the plane hitting the water a direct copy from the comic.
- Barry and Nora mention the fictional Happy Harbor, Rhode Island. In the DC comics, this was the location of the Justice League's first headquarters, as well as the main setting of the animated series Young Justice.
- The slang Nora often says in this episode, "schway", originated from the TV series Batman Beyond, where it is used by many of the teenage characters in the future Gotham City.
- Nora mentions that a man named Ryan Choi made Barry's new suit. In the DC comics, Ryan Choi is a student of Ray Palmer and his successor as the Atom.
- Ralph states that a nonexistent individual, Cameron Mahkent, signed off on Caitlin's father's death certificate. In the comics, Cameron Mahkent is the super-villain Icicle.
- This is also a reference to how Caitlin's ice-based powers manifested in front of her dad.
- ↑ Flash Season Premiere Description: “Nora” - FlashTVNews
- ↑ "The Flash season 5 spoilers: King Shark and Gorilla Grodd to team up? Boss reveals all" - Express
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