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The film was finalized in May 2009, but the crew reshot some shots in October 2009.
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The protagonist of the film is named Wally. This word also means "idiot, waste" in English. According to the description in the film, Wally is indeed a waste.
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The film is based on a short story by Jeffrey Kent Eugenides. The novel was rewritten into a screenplay by Allan Loeb in 2008, but it was blacklisted as the worst screenplay in the same year.
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The original name of the film was "Lubrication Tube", but the title was opposed by many women, and the producer had to change the title for this reason.
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Part of the film was inspired by the comedy movie "Surrogate Mother", but the director and screenwriter turned the story of two women together into a love triangle.
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The heroine Aniston has not been a mother in real life, so in the process of playing Casey, she received a lot of support and help from the director and actor Jason Bateman.
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The director had considered having other actors play the role of Wally, but due to their different schedules, the role was eventually played by Jason Bateman .
The Switch behind the scenes gags
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Wally Mars: So that we're clear, she did not put me in the friend zone. We put each other in the friend zone. It was a mutual placement. You know that.
Leonard: Let's be honest with ourselves, you had your window with Kassie and you went all Wally on her and you doomed it.
Wally Mars: What is that even supposed to mean?
Leonard: You shared too much too soon. Quickest way to kill a romance. You gotta hide the crazy, at least through the appetizers.
Wally Mars: I see. So just so that I'm clear, which one of your three failed marriages taught you that lesson?
Leonard: All three, and they're special in various ways.
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[last lines]
Wally Mars: Every once in a while, out of all the randomness, something unexpected happens that pushes us all forward. And the truth is, what I'm struggling to think, and what I'm struggling to feel, is that maybe the human race isn't a race at all.