Actress Kate Hudson, who costars in the Larry David movie filming in Andover, was spotted at Lydia Shire’s restaurant Scampo on Wednesday night. . . . Congressional candidate Joe Kennedy III was at the Cheesecake Factory in the Atrium Mall in Chestnut Hill on Tuesday night. . . . Harvard Law professor Alan Dershowitz had dinner at Russell House Tavern before appearing on “Piers Morgan Tonight’’ that night. Dersh and two friends dined on crispy pig’s head cake, pig tail pierogies, and grilled prime rib knuckles.