Can you remember how you spent your childhood summers? Were they by the pool eating concession stand junk? Biking everywhere you went? Fist-fighting your best friend? Falling for a girl from out of town? Something along those lines? Or maybe you just saw a movie like that. That kind of easy familiarity is what teen comedy “Snack Shack” comfortably sets up shop on. Armed with a talented cast, writer-director Adam Rehmeier’s 1991-set feature happily squares itself in a tradition of teenage hedonism and broad learning opportunities, settling into a generic but warm glow.

Early-20s actors Conor Sherry and Gabriel Labelle lead the film, stretching the laws of verisimilitude playing 14-year-old best friends, but emerging plausibly teenaged with their lame-brain rapport. The two play Aj and Moose, a pair of hustlers hunting for their next score after home-brewing a “drinkable as fuck” beer. When the friendly college-aged lifeguard Shane...