Notice something strange in the poster for The Wings of the Dove? Behind the early 20th-century love triangle of Helena Bonham Carter, Linus Roache, and Alison Elliott floats a distinct anachronism: a Venetian motorized water bus — with headlights no less. Though the film, based on the Henry James novel, was updated from 1902 to 1910, water buses had not yet been introduced in Venice. Miramax admits historical fidelity was compromised for art’s sake. ”It was the best [poster] shot of Venice we had that incorporated the cast, the water, and the gondola,” says a studio spokeswoman, who notes the creative department blurred the background but couldn’t ”obscure the image completely.” At least Bonham Carter’s not using a cell phone.