Amanda Seyfried was cast in the lead role but after the production was delayed, Seyfried had to drop out due to scheduling conflicts. Margot Robbie replaced her.
Tobey Maguire was originally cast as the lead role.
Although set in the Midwestern United States of America, the film was shot entirely in New Zealand's Banks Peninsula. The two areas share a similar geography.
The film is based on the science-fiction novel "Z for Zachariah" by Robert C. O'Brien, which was published posthumously in 1974. The film's "love triangle" is a major deviation because there are only two protagonists - Ann and Loomis - in the novel.
After leaving the filming wrap party in Methven, New Zealand, Chris Pine was pulled over by police and charged with drunk driving. He pleaded guilty and was disqualified from driving for six months and ordered to pay $93 in reparation. He was let off a fine after making a sizable donation to charity.
The opening scenes in the trailer were shot in the small town of Welch, West Virginia.
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