TNT has cast Monica Potter ( Boston Legal ) in their Madison Avenue-set drama pilot, Truth in Advertising , which revolves around the multi-million dollar advertising agency Rothman, Greene & Moore (what, no Dewey, Cheatum & Howe?), a high-stakes ad agency whose execs are constantly driven to prove why they deserve to keep their plum gigs. Potter joins the previously cast Eric McCormack and Tom Cavanagh in the pilot, which begins production later this month. Potter will play Sarah Krajicek-Hunter, a divorcee and copywriter who is brought into the firm. Lest you be confused by the similarities between this project and AMC's Mad Men , rest assured that Truth in Advertising is set firmly in the present day. The script for this pilot has just made its way into my inbox, so I'll have to let you know what I think. * * * Meanwhile, in other casting news, Robot Chicken auteur Seth Green ( Buffy the Vampire Slayer ) has been cast in a two-episode...