'Django Unchained' ★★

In "Django Unchained," which has its moments of devilish glee in and among dubious wallows in numbing slaughter, writer-director-trash compactor Quentin Tarantino delivers a mashup of several hundred of his favorite movies, all hanging, like barnacles, onto a story of a freed slave (Jamie Foxx) and his bounty-hunter savior (Christoph Waltz) out to rescue Django's wife (Kerry Washington) from a venal plantation owner (Leonardo DiCaprio). The plantation's "house slave" (Samuel L. Jackson) has no d...