“I’m starting to think I’m never going to meet a woman who understands me,” laments Ezra (Jonah Hill), a 35-year-old man with a desk job at a brokerage firm and zero romantic prospects. Ezra is a bit of a hipster: He wears his hair in a ponytail, collects Nike sneakers and sports elaborate tattoos on his arms. But Hill, cast as an earnest romantic comedy lead for the first time in his career, amps up the character’s likability, too: He’s a modest hipster, a socially awkward mensch who doesn’t always know how to stand up for himself. When he goes...