The Flash (2014)

Crisis on Earth-X, Part 3 - S4-E8

Trivia: Supergirl says to her doppelganger "General, can you step outside." That line was said by Superman in Superman II.

oswal13

Going Rogue - S1-E4

Trivia: Kahndaq is mentioned heavily in this episode. Kahndaq is a fictional country, home to DC anti-hero, Black Adam.

MasterOfAll

Attack on Gorilla City - S3-E13

Trivia: Julian asks Barry "are you gonna go to the planet of the apes?" Tom Felton played Dodge Landon in the modern remake of that film.

oswal13

Attack on Gorilla City - S3-E13

Trivia: Before Barry and the others travel to gorilla city, Julian says something about Bludhaven. This is the city of Dick Grayson, aka Nightwing, former partner of Batman as the first Robin.

oswal13

Trivia: Robbie Amell, who plays Caitlin's fiancee Ronnie, is the cousin of Stephen Amell, who plays the lead role on Arrow.

Elseworlds, Part 1 - S5-E9

Trivia: Oliver asks Clark "who are you?" and he responds "a friend", that line was taken from Superman the movie while Clark and Lois are talking.

oswal13

Elseworlds, Part 1 - S5-E9

Trivia: When Oliver and Barry breach to Earth-38, the transition music is Remy Zero's "Save Me", famous for its use as the theme song to Smallville. Other homages include the same barn used for the Kent farm and Lois calling Clark "Smallville."

Cubs Fan

Fallout - S1-E14

Trivia: Towards the end when Caitlin and Iris are talking about her cousin they mention Midway. That's the city of Hawkman and Hawkgirl.

ozwal13

Fallout - S1-E14

Trivia: Towards the end Iris asks Caitlin about her cousin and they mention Coast City, the hometown of Hal Jordan, AKA Green Lantern, another DC superhero.

ozwal13

All Star Team Up - S1-E18

Trivia: When The Atom first appears, the characters say "It's a bird" "It's a plane", an obvious reference to Superman, played by Brandon Routh in "Superman Returns", who also plays The Atom in this episode.

Freakspaulding

Tricksters - S1-E17

Trivia: Mark Hamill plays James Jesse, the original Trickster, a role he also played twenty-five years earlier in the 1990 Flash TV series.

Cubs Fan

Things You Can't Outrun - S1-E3

Trivia: The movie Barry and Iris are leaving is entitled Blue Devil II. A reference to DC Comics superhero Blue Devil, who was a stuntman that worked on the in-universe "Blue Devil" films.

MasterOfAll

Snow Pack - S5-E19

Trivia: Near the end, when Nora (XS) is about to arrive out of the Speed Force, the street signs say "McCraw" and "Moy", a nod to the creators of XS, Tom McCraw and Jeff Moy.

Bishop73

Into the Void - S6-E1

Trivia: Cisco plays the Queen song "Flash" while Barry is running through the black hole. This song is actually a reference to Flash Gordon (used as the theme song for the 1980 film), not the speedster named Flash.

Bishop73

Elseworlds, Part 1 - S5-E9

Trivia: The entrance theme "Save me" from Smallville TV show can be heard when Barry and Oliver are looking for Kara and Clark.

oswal13

Elseworlds, Part 1 - S5-E9

Trivia: There is a reference to Smallville TV show in the opening scene among the heroes - Green Arrow played by Justin Hartley is lying on the ground.

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Elseworlds, Part 1 - S5-E9

Trivia: The music made by Danny Elfman for Batman and The Flash movies can be heard in Gotham city.

oswal13

Elseworlds, Part 1 - S5-E9

Trivia: Elizabeth Tulloch, who plays Lois Lane, is married to David Giuntoli, with whom she starred on Grimm, and who had auditioned to play Clark/Superman in Man of Steel.

Cubs Fan

Goldfaced - S5-E13

Trivia: Sherloque develops a crush on Renee Adler, a clear play on "Irene Adler" from other Sherlock Holmes media. Although only appearing in one book, in TV shows/movies Irene is frequently a love interest of Holmes.

Jon Sandys

I Know Who You Are - S3-E20

Trivia: When Barry is suffering amnesia he asks to be named Bart, Bart Allen in the comics is grandson of Barry and the future Flash.

oswal13