An American Pickle, the HBO Max comedy about a man who is cryogenically, um, pickled, and awoken in the future to meet his modern ancestor, stars Seth Rogen in two roles, interacting constantly with "himself." How did they pull this ubiquitous visual effect off so well, and so seamlessly? Luckily for us curious filmmaking fans, HBO Max has just released a fascinating behind-the-scenes look at the doubling of one Mr. Rogen. [caption id="attachment_908147" align="alignright" width="350"] Image via HBO Max[/caption] The film's director Brandon Trost (Rogen's longtime DP making his directorial debut) concedes …