 " <unk> <unk> But They Don 't Go Down " was written by Phil <unk> and directed by Jason Bloom , marking <unk> 's fifteenth and final writing credit and Bloom 's fourth and final directing credit for Veronica Mars , after " Green @-@ Eyed Monster " , " Nevermind the <unk> " , and " Charlie Don 't Surf " . The episode features the final appearance of Dianna Agron , famous for her role as Quinn <unk> on Glee , as Jenny <unk> , Veronica ’ s classmate . Agron had previously appeared in the episode “ President Evil ” . The episode prominently features Weevil ( Francis <unk> ) , who appears after a five episode hiatus . During the third season , <unk> was struggling with a medical condition , and the medication he took for this illness caused his face and neck to swell and break out with <unk> . 
