The twentysomething rom-com “(500) Days of Summer” has been a hit on the festival circuit and it’s easy to see why. Parroting the hipster yet accessible feel-good vibe of “Juno” and “Garden State,” this sweetly engaging trifle goes down as easy as a cold lemonade on a hot afternoon. That it’s a compendium of indie-gone-mainstream ideas, and not particularly believable, probably isn’t going to hurt it with its target audience.
Tom (Joseph Gordon-Levitt) is a junior writer at an L.A.-based greeting-card company and an ’80s-mope-rock obsessive who believes he has found his soulmate in the new executive assistant, Summer (Zooey Deschanel), who shares his passion for the Smiths. The movie ping-pongs through the months of their relationship, from the giddy highs of newfound love to the oceanic lows of the breakup.