Rudd has done some TV guest work in the past, including a one-episode stint on “Veronica Mars” (a show created by another old friend — and “Party Down” co-creator — Rob Thomas) and several episodes on “Reno 911.” Back in the waning days of NBC’s Thursday night dynasty, he spent most of the final season of “Friends” playing Phoebe’s husband Mike Hannigan (or, as he is sometimes known, Crap Bag).