Beatlemania is both plot device and backdrop in first-time director Robert Zemeckis’ period comedy about a cluster of Jersey teens screaming and shenanigan-ing around New York City in pursuit of the Fab Four on the day of their generation-defining appearance on the Ed Sullivan show.   If you’d like to watch ahead for next week’s film, we will be discussing and reviewing Guillermo del Toro’s The Devil’s Backbone (2001).