Directed by Josh Schwartz, the creator of “The O.C.”, “Gossip Girl” and co-creator of “Chuck”, “Fun Size” is a cute, well-intentioned and intermittently successful update of the 80’s teen movie genre, especially “Adventures In Babysitting”. This Halloween comedy stars Victoria Justice (“Zoey 101”, “Victorious”) as Wren DeSantis, a studious and college-bound girl and Jane Levy ..