Cast members of the forthcoming "Episode VII" who are in the Italian city for the Venice Film Festival are keeping mum about details of the ultra-anticipated movie. British actress Gwendoline Christie, who plays Brienne of Tarth in "Game of Thrones" and Commander Lyme in two "Hunger Games" movies, joked at a Vanity Fair-sponsored party that "Star Wars" producers had gone to extraordinary lengths to maintain secrecy. Stop-motion animated feature "The Boxtrolls" is about a community of underground creatures who scavenge trash from the humans above to build elaborate mechanical devices. Based on Alan Snow's children's adventure novel "Here Be Monsters," it features the voices of Ben Kingsley, Elle Fanning, Simon Pegg, Tracy Morgan and teenage "Game of Thrones" actor Isaac Hempstead Wright as Eggs, a human boy raised by the Boxtrolls.