The cast of 30 Rock was out and about the city streets yesterday, shooting an upcoming episode that extends two of the season's running plots: Jack Donaghy's shaky relationship with his high-school pal Nancy Donovan (played by Julianne Moore) and Liz Lemon's shaky relationship with her nitrous-oxide pal Wesley (played by Michael Sheen). Here's a sort of preview via photos from the set: Click through to get answers for long-standing questions like "What color is Tina Fey's dress?" and "What kind of bike helmet does Michael Sheen wear?" The best part? You don't have to hear Julianne Moore's accent!