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There was originally a scene in the film where two protagonists drove to the supermarket during sleepwalking and ate all the food there. Director Adam McKay liked the scene very much, but felt that it did not match the overall style of the film, so he reluctantly gave up.
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The film was shipped to some theaters with the words "Crazy Team" written on the packaging.
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At the end of the film, Will Ferrell sang and John C. Reilly played the drums. The song was indeed sung by Ferrell himself.
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John C. Reilly also appeared on the set when he didn't have his own play to help other actors in the dialogue.
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The film is the third collaboration between Adam McKay, Will Farrell and John C. Reilly following the 2007 comedy film "Night of Talladega".
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About 30% of the content of the film is improvised by actors or by the director in front of the camera.
Step Brothers behind the scenes gags
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Brennan Huff: Your drumset's a whore! I tea bagged your drumset!
Dale Doback: My drumset's a guy so it makes you gay, you fucker!
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Dr. Robert Doback: [as Dale is playing video games in his room] Dale... Dale, I'm leaving for the conference.
Dale Doback: You leave me money for pizza, Dad?
Dr. Robert Doback: Yeah. There's $20 on the hall table. Do not order pay-per-view, buddy!
Dale Doback: But what if I want wings?
Dr. Robert Doback: [as he leaves out of the house] You don't need wings!
Dale Doback: That's *NOT* ENOUGH, DAD!