With warm nostalgia for Beatrix Potter's classic children's tale, "Peter Rabbit " director, producer and co-writer Will Gluck channels the author's earnestness into a sweet film sure to delight young fans. Adults may find the plot predictable and the pacing a bit wanting, but the dynamic animation and beloved characters help compensate, as does the film's cheeky self-awareness. As in the book published in 1902, the story begins with Peter Rabbit (James Corden) disobeying his parents' rules and sneaking into Old Mr.