Joker - Secret trivia, hidden Batman Easter eggs and surprising facts you didn’t know about the movie

We reveal nine things you might not know about Joker, the Oscar-nominated movie directed by Todd Phillips and starring Joaquin Phoenix.

Published: 29 January 2020 - 3.03pm
© 2019 Warner Bros. Entertainment Inc. TM & © DC Comics

Joker centers around Batman’s iconic arch nemesis in a gritty, standalone origin story that hasn’t been told before on the big screen.

The Golden Globe-winning and Oscar-nominated movie stars Joaquin Phoenix (Walk The Line, Gladiator) as Arthur Fleck, who later becomes the Joker, and is directed by Todd Phillips (The Hangover trilogy).

Here, we reveal trivia, hidden Batman Easter eggs and surprising facts you might not know about the Joker film, as it’s available to buy on the BT TV Store (January 27) and to rent and on DVD (February 10).

1.  Joaquin Phoenix would walk off set in the middle of a scene
In an interview with The New York Times, director Todd Phillips revealed that Phoenix worried his co-stars by leaving the set during takes. Phillips said: “In the middle of the scene, he’ll just walk away and walk out. And the poor other actor thinks it’s them and it was never them - it was always him, and he just wasn’t feeling it.”

Joker image © 2019 Warner Bros. Entertainment Inc. TM & © DC Comics

2. Keep your eyes peeled for some hidden actor cameos
According to, Justin Theroux plays a guest on the Murray Show who Arthur Fleck watches on TV and imitates. The voice of director Todd Phillips is heard too - he's the comedian who precedes Fleck at the comedy club, telling an off-colour joke.

3. An unplanned emotional moment remained in the film
IMDB reports that Joaquin Phoenix unexpectedly shed a tear during the very first take. When his character looked in the mirror as the score was playing, a little tear appears - which director Phillips kept in.

4. There’s a nod to the co-creator of Batman
Arthur’s social worker at the start of the film is named Debra Kane. Den of Geek reports that Bob Kane was the co-creator of both Batman and the Joker in the comics. 

5. Bradley Cooper is a producer on the film
The Star is Born actor was drawn to the film after working with the film’s director Todd Phillips on War Dogs. Speaking about how he came on board, Cooper said: “Todd called me and said, ‘I have this crazy idea for this sort of alternate version of DC, and the first one is the origin story of Joker’. I thought, ‘This is just so bold.’”

6. Don’t expect a Joaquin Phoenix/Robert Pattinson crossover
At the Toronto International Film Festival, director Todd Phillips insisted that Joaquin Phoenix's Joker and the upcoming new Batman played by Robert Pattinson will not collide. "I don't see [Joker] connecting to anything in the future," Phillips said. "This is just a movie."

Joker image © 2019 Warner Bros. Entertainment Inc. TM & © DC Comics

7. It’s broken box office records
Joker has grossed over $1 billion, making it the first R-rated film to pass the billion-dollar mark at the worldwide box office.

8. There's a hidden Easter egg for fans of the Batman TV series
When Arthur Fleck goes to Wayne Manor, a young Bruce Wayne slides down a pole in his playhouse to go meet Arthur at the gates. In the 1966 television series, Batman and Robin would slide down their Batpoles from Wayne Manor to reach the Batcave, according to

9. And yes, that is Alfred in the same scene
As reported by, the British man roughed up by Arthur who leads Bruce away is none other than Bruce Wayne’s loyal butler, Alfred Pennyworth, played by Douglas Hodge.

Joker is available to buy on the BT TV Store from January 27, and to rent and on DVD from February 10.