In the arch make-believe documentary “Paper Heart,’’ actress-comedian Charlyne Yi crisscrosses the country interviewing average Americans about love. These sequences are ostensibly real, but Yi’s director, Nicholas Jasenovec, is played in front of the camera by actor Jake M. Johnson, and the scenes documenting Yi’s growing romance with actor Michael Cera, playing himself, are patently staged. The movie’s a platypus: cute as the dickens but what the heck is it?
The hook is that Yi doesn’t believe in love, or says she doesn’t - who knows what’s really part of the act? She’s a drolly funny figure, though, a young woman with the thick glasses and asocial slouch of a stereotyped Asian-American nerdgrrl but the antic rebel grin of a gremlin. You saw Yi in a small role as the stoner girlfriend in “Knocked Up’’ and we see snippets of her stage act here; in one bit, she tells the audience she’s wearing a wig, then teases them for being so gullible, then teases them further by removing a wig that looks exactly like her own hair.