After killing off Carson Daly in its surprisingly good premiere, Jimmy Fallon’s clever Downton Abbey parody, “Downton Sixbey,” returned to his talk show last night, with Roots frontman ?uestlove, set to take his rightful place as heir to Studio 6B (get it?). Brooke Shields and Fred Armisen were also back Fallon’s wife and middle daughter Lady Hedith, as were the motley crew of bitter servants and A.D. Miles as the snarky Dowager Countess. If the latest edition retread some old ground (there’s that time-sucking iron foot again), it also offered enough surprises—Armisen on drums! Whoopi Goldberg as ?uestlove’s mother!—to remind us why this is still one of the sharpest parodies on television. Late Night with Jimmy Fallon, quickly becoming must-see late night TV.