Here , working from a densely literate script by Diablo Cody ( aka the author and blogger Brook Busey-Hunt ) , Juno depicts a world of dead-pan comic exchanges where the news of Juno 's pregnancy is greeted with bemusement rather than ire by her unflappable parents , where the decision to procure a hasty abortion is rejected in favour of playing surrogate mom for a local wealthy couple ( played by Jason Bateman and Jennifer Garner ) , and where that same surrogacy eventually tests the emotional mettle of all involved and teaches Juno some tough lessons about the transience of love .