- "Sara? Is it possible that our fugitive killer is a possessed doll?"
- "Horror movie 101."
- —Ray Palmer and Sara Lance
|With Rory and Ava at odds, Sara tries to come up with a way for them to get along, but all is put on hold when a new magical creature attacks the Legends. Constantine is forced to confront his tragic past but it could have devastating consequences for the rest of the team. Meanwhile, Mona has a crush on someone she works with and gets some advice from Nate.|
Preparation ran from September 5 until September 18, 2018. Shooting ran from September 14 until September 26, 2018.
- The episode's title is a reference to the musical Hello, Dolly!.
- Former Legends series regular Victor Garber (who portrays Martin Stein in the Arrowverse) departed the series prior to the mid-Season 3 finale ("") at the time he was cast in Hello, Dolly!.
- This episode marks the reappearance of Leo Snart's puppet of Professor Stein, which hasn't been seen since "".
- A Sailor Doll is seen attacking one of the Legends with a knife which is a reference to serial killer doll named Chucky.
- Sara refer to it by saying "I think we may have a Chucky situation here." when she means that the Dybbuk is in a doll. She also refers to it again later, saying "One thing I learned from the Chucky movies is the doll always comes back"
- The sailor outfit could also be a reference to Robert the Doll, a haunted doll which was also an inspiration for the Child's Play series.
- In Jewish mythology, a dybbuk is a malicious possessing spirit believed to be the dislocated soul of a dead person. It supposedly leaves the host body once it has accomplished its goal, sometimes after being helped.
- The Emmy-nominated portrayal of Marie Laveau by actress Angela Bassett that Gideon mentions is a reference to Bassett's role as Marie Laveau in American Horror Story.
- A running gag of Ray's mustache being half-removed and grown back parodies former Superman actor Henry Cavill who was sporting one for his role in Mission Impossible: Fallout while filming the Justice League re-shoots before it was digitally removed in the editing process.
- The name of the demon hounding Constantine is revealed to be Neron who first appeared in Underworld Unleashed #1 in 1995, Neron is one of the more infamous players in DC Comics' cosmology. A demon-lord who can't resist making Faustian bargains with mortals, Neron once tried to take over the universe by gathering a mass quantity of souls, which are the currency of Hell and the source of his power. Neron approached numerous super-villains then numerous superheroes, offering them their hearts' desire in exchange for their souls, all while plotting a way to acquire the purest soul on Earth - an object that would make Neron all-powerful! Though his scheme was ultimately thwarted, Neron has remained a power to be reckoned with in the DC Universe, always ready to make a deal with anyone desperate enough to seek his help and pay his price.
- Nate is not seen during the temporal explosion caused by Constantine; however, the promo for the next episode shows him as a prime victim of the new timeline.
- Before the start of the season, Mona was originally promoted as having wolf-like powers, but this might still take place because of her injury from Konane.
- Marie seems less knowledgeable about magic than John, who is always correct about how it works.
- Ava mentions that she has a hobby of reading about serial killers, and when asked about the quiz on the box of Big Easy O's cereal (Who is the most prolific serial killer in the United States?), Ava says that the correct answer is Ted Bundy, but that in her opinion, John Wayne Gacy had more victims than he confessed. In reality however, John Wayne Gacy (with 33+ victims) had more confirmed victims than Ted Bundy (who confessed to 30 killings, though his total body count is unknown).
- Furthermore, in real life, at the time that this episode first aired, Gary Ridgway (who wasn't listed as an option in the quiz, and has been convicted of 49 murders but confessed to 71 killings) was credited as the most prolific serial killer in the United States. That title went to Samuel Little, though he hasn't been convicted of all the murders he's suspected to have committed (having been convicted of 61 killings, but suspected to have murdered as many as 93 victims).
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