- "My best friend Nate, he, uh, has a desk job. And Amaya,... Well, she's gone. I actually really miss her. She was kind of our moral compass. Helped us do the right thing when it wasn't always easy to do the right thing."
- "I never knew disco could get so balmy."
- —Ray Palmer and Charlie
When the Legends discover a fugitive is hiding in 1970’s London, they realize he is part of a gang that is targeting the British Monarchy. Trying to stop the gang, they realize someone from the Legends must infiltrate them. Surprising everyone, Ray is the one to gain their trust after he is put through a series of tests with help from Sara and Rory. Meanwhile, Gary shows Nate the ropes at the Time Bureau, but it turns out to be anything other than an ordinary day at the office.
Preparation ran from July 18 until July 27, 2018. Shooting ran from July 30 until August 10, 2018, with a break on August 6 for British Columbia Day.
- The episode's title is a reference to the ABBA song of the same name.
- Gary stating they (the Time Bureau) "dare to defy" is a reference to the CW's slogan that has been used since the 2014–15 season.
- When Mona delivers tacos to the Time Bureau, she asks Gary if he's "Mr. Green". He informs her that his name is Gary; then he grins and says "Mr. Green's in the conservatory with the lead pipe." This is a reference to the board game, Clue (known outside North America as "Cluedo") where players have to solve a murder, deducing which person is the killer, which room the murder happened in, and which of several potential weapons was used (with Mr. Green being the name of one of the potential suspects).
- However, in UK editions of the game, Mr. Green is called "Reverend Green"
- In the original Hellblazer comics, Constantine and his band Mucous Membrane performed during the original wave of punk music featured here during the 70s and the comics were written and set starting in the 80s. Since this version Constantine is not from that era, his band is meant to be from later and he is just a fan of this era, but this episode is partially a nod to his real history.
- After being caught out for having replaced ABBA at some point, Ray mutters "mamma mia", referencing the movie Mamma Mia! Here We Go Again, as the episode where the Legends replace ABBA was titled "".
- It may also be referencing the ABBA song of the same name.
- The steering wheel of the van that the Legends use to go to the Smell's concert (which the band subsequently gets into with Ray) is mounted on the left side of the vehicle. However, because they're in England, the steering wheel should be on the right side of the van instead.
- ↑ Legends of Tomorrow - Episode 4.03 - Dancing Queen - Press Release - SpoilerTV
- ↑ Keto Shimizu (@ketomizu) - Twitter
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