Trivia

Liam Neeson agreed to play the role of Clinch on the condition that he do a broad Irish accent.

Charlize Theron had shaved her head for Mad Max: Furia en el camino (2015), and had to wear a wig.

Neil Patrick Harris gets to say his famous catchphrase from How I Met Your Mother. Cómo conocí a tu madre (2005) when he is challenged to a duel by Albert: "Challenge accepted!" Neither of the writers knew that when they were writing the movie. Later, during test screenings, they didn't know why audiences were laughing.

Mark Vanselow was Liam Neeson's stunt butt. Vanselow was Neeson's friend and stunt double for many years. Neeson said Vanselow agreed to be his stunt butt as a sign of their friendship.

The made-up death chant that Albert bellows is actually the 1980s song "Tarzan Boy" by Baltimora.

Ryan Reynolds: the bar patron Clinch shoots.

Ewan McGregor: At the fair, when Albert asks why everyone is laughing at Foy's joke. McGregor was shooting another movie in the area, and was happy to cooperate.

Kaley Cuoco: the girl Albert tries to pick up in the shop (deleted scene in the "unrated" version).

Seth MacFarlane: [reusing Family Guy gags] During his pow-wow with the Indians, Albert says "Mila Kunis, Mila Kunis" in Native American speak. The translation below reads "fine." The same gag was used with Jabba the Hutt in It's a Trap! (2011).