- For The Flash episode of the same name, see Fallout (The Flash).
- For Supergirl episode of the same name, see Fallout (Supergirl).
Preparation ran from June 27 until July 6, 2017. Shooting ran from July 7 until July 19, 2017.
- A brief glimpse of the DC fighting game Injustice 2 makes an appearance where William is shown playing as Poison Ivy (off-screen). In addition, there is an audio clip of Poison Ivy performing a supermove on another Poison Ivy in that same scene. Stephen Amell previously voiced the Green Arrow in Injustice: Gods Among Us whenever his suit as the Arrow was used for the character while Echo Kellum previously participated in the April 28, 2017 livestream of the Injustice 2 WatchTower.
- Felicity says that she wouldn't ignore the option that Earth Two Laurel came back from the dead because of previous experience with the Lance sisters, referring to the many times Sara Lance died (or was at least thought to be dead) but then came back to life. The joke about Sara never staying dead was referenced in many episodes of DC's Legends of Tomorrow.
- This episode features the return of Raisa, who has not been seen since "".
- Raisa has been absent for 4 seasons (114 episodes overall), the greatest of any Arrow character.
- This is the final episode of Arrow to feature a flashback story featuring Lian Yu. However, it is not a finale episode to feature this story device.
- Slade Wilson, John Diggle, Felicity Smoak, Rene Ramirez, Curtis Holt, Dinah Drake, Quentin Lance, Earth Two Laurel Lance, Nyssa al Ghul and Thea Queen all survived the explosions on Lian Yu. However, the latter ended up in a coma. In addition, John suffered nerve damage in his arm, impairing his ability to properly aim a gun.
- While Samantha Clayton, Malcolm Merlyn and Digger Harkness are confirmed to have died, the fates of Talia al Ghul and Evelyn Sharp remain unknown, even after the season finale.
- This episode takes place 5 months after the events of "".
- At the end of episode, Felicity tells Oliver to turn on Channel 52 on the television when hearing the news about Green Arrow's identity. Once again, a reference to The New 52 or even 52 comic series.
|Arrow season 6|
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