History Recap / ArrowS4E8LegendsOfYesterday

** Having the Hawks' wings being able to appear and disappear as necessary makes it easier on all involved instead of having to explain why they wear artificial wings and fly using nth metal (the standard comic explanation) or having them walk around with wings all the time (the Franchise/{{DCAU}} version of Hawkgirl and other Thanagarians).

* UpToEleven: You thought things were bad [[Recap/TheFlash2014S1E15OutOfTime the last time]] Barry had to time-travel to the previous day? You ain't seen nothing yet...

* NotImportantToThisEpisodeCamp: For the first time this season, Damien Darhk does not make any kind appearance nor is involved in the plot.

** Even though they [[AbsenteeActor did not appear]] in this episode, most of the characters on ''Series/TheFlash2014'' (Iris, Joe, Harry, Captain Singh, Jay, Patty, and the villains that Oliver and Barry defeated that were imprisoned in Iron Heights) and Dinah Lance. Possibly also [[TheyKilledKennyAgain Sara]], assuming that she's still staying at her mom in Central City.

* AbsenteeActor:
** On the ''[[Series/TheFlash2014 Flash]]'' side, Harrison Wells and both Iris AND Joe West are missing.
** On the ''Arrow'' side, Captain Lance is missing.
** Creator/AlexKingston is again a no-show (presumably she was busy [[Series/DoctorWho over in Cardiff]]), despite Laurel visiting her mother being the excuse for why she wasn't in the preceding ''Flash'' episode.
** When we last saw Sara, she said that she'll visit her mother. She did not appear in this episode.

* ScrewTheMoneyIHaveRules: Samantha never cashed the million dollar check Moira gave to her (and presumably the second million she promised on her return to Central City) because she did not the Queens to have any claim on her son.

* CallBack:
** [[Recap/TheFlash2014S1E15OutOfTime Once again]], Barry sees a second version of himself running alongside him, and once again, it's a portent that he will travel through time in this episode.

* ScrewTheMoneyIHaveRules: Samantha never cashed the check Moira gave to her.

** The check Moira gave Samantha to disappear was for 2 million dollars, but the un-cashed check she shows Oliver in this episode is for only 1 million.

* DiggingYourselfDeeper: Felicity would never have realized that Barry was hiding something from her (namely, the DNA test Ollie asked for) had it not been for Barry pocketing it in ''superspeed''.

* {{Bromance}}: Oliver and Barry cemented their new found closeness with a hug--though Oliver was a bit reluctant, and only conceded when Barry threatened to hug him at SuperSpeed.

* AmicableExes: Cisco discontinues his relationship with Kendra after knowing that she should be with Carter, but remains supportive of her, like when he gives her something to ask for help.

* {{Bromance}}: Oliver and Barry cemented their new found closeness with a hug.

* BeenThereShapedHistory: Carter states that Savage was responsible for the 1887 Huang He (Yellow River) flood in China. Savage also puts down Ollie's skills by claiming that he was the one to teach [[Myth/RobinHood "Robin of Locksley"]] how to use a bow.

** Barry tells Kendra not to let Oliver train her, since whenever it rains, [[Recap/TheFlash2014S1E8FlashVsArrow he still get back pains]] from when Oliver shot him in the back with arrows.

* GetOut: In the Ancient Egypt flashback, Vandal Savage caught Prince Khufu and Priestess Shiera in the same bedchamber. Prince Khufu proceeds to tell Savage to get out before starting a brawl.

* SpecialEditionTitle: As in [[CallBack "The Brave and the Bold,"]] the arrow is replaced by the lightning bolt from the Flash titles.

** This would have been Carter and Kendra's [[{{Reincarnation}} umpteenth time]] death and the very first time they officially cheated it.

* DidTheResearch: The 1887 flood that Carter states Vandal Savage was responsible for is one of the few widespread natural disasters that could, theoretically, really have been caused by a single relatively normal human arranging for breaches (using gunpowder explosives, for example) in the dykes holding back the Huang He.

* TheyKilledKennyAgain: Had Barry not {{Time Travel}}led, this episode marked several characters have cheated death.

** In the comics, Ollie's son is named Connor (and he has another son named Robert); here he's named William. WordOfGod is that production wanted the freedom to involve Connor some other way later on, and they wouldn't be able to if he was ten years old. [[spoiler:Connor turns out to be Diggle's post-Flashpoint son in a BadFuture]].

** Barry tells Kendra not to let Oliver train her, since whenever it rains [[Recap/TheFlash2014S1E8FlashVsArrow he still get back pains]] from when Oliver shot him in the back with arrows.

** In the comics Ollie's son is named Connor (and he has another son named Robert), here he's named William. WordOfGod is that production wanted the freedom to involve Connor some other way later on, and they wouldn't be able to if he was ten years old. [[spoiler:Connor turns out to be Diggle's post-Flashpoint son in a BadFuture]].

** Ollie doesn't tell Felicity about his son, having forgotten that KeepingSecretsSucks, which is really egregious since he took pains to avoid this in the last episode. Although to be fair, in this case the secret-keeping of not telling anyone about his son was part of an agreement with the boy's mother which would allow him to see William every once in a while.
** While Barry warns Oliver about the dangers of changing the timeline, he is invoking his attempt to save his mother that resulted in the near-destruction of the the city (and world) and the death of Ronnie Raymond. He seems to have overlooked that when he earlier hopped back in time unintentionally and made changes he improved the outcome of events (saved the city, prevented thousands of deaths, prevented Cisco's murder by Eobard Thrawne, stopped Joe from being kidnapped and brutally beaten) with the minor exception of his brief relationship change with Iris.

** [[Recap/TheFlash2014S1E15OutOfTime Once again,]] Barry sees a second version of himself running alongside him, and once again, it's a portent that he will travel through time in this episode.

* CompositeCharacter: Vandal Savage is one for Hath-Set, the Egyptian villain who's tied to the Hawk's various deaths and rebirths. Savage even goes by the name of Hath-Set in the flashbacks.

* ForegoneConclusion: Due to Vandal Savage being the BigBad of ''Series/LegendsOfTomorrow'' it's obvious his death is not going to stick.

* ManipulativeBastard: Malcom proves once again his villainous nature by helping Savage getting resurrected just so he owes him a favour.

* NotImportantToThisEpisodeCamp: For the first time this season, Damian Darhk does not make any kind appearance nor is involved in the plot.

* RightForTheWrongReasons: Samantha doesn't want William to be involved in Oliver's life as she considers it would be bad and even dangerous for him to be exposed to Oliver's life...the life of an immature, partying, womanizing playboy, which she still thinks of him as.

* ShipSinking: Felicity ends her relationship with Ollie since he didn't tell her he has a son (she's not mad that he has a son, but that he kept it from her). That's undone by the time travel but the fact he still doesn't tell her at the end implies he's just kicking the can down the road.
* ShoutOut:

* DeusExMachina: Once again, Barry's super speed helped him travel back in time and gave Team Flarrow the second chance to fight Vandal Savage properly.

* DeathIsCheap: Even though Savage is reduced to nothing more than a pile of ashes, Malcolm seems to know a way to bring him back to life.

** In the comics Ollie's son is named Connor (and he has another son named Robert), here he's named William. WordOfGod is that production wanted the freedom to involve Connor some other way later on, and they wouldn't be able to if he was ten years old.