Tommy Lee Jones, who will reportedly star in a third installment of “Men in Black,’’ dined at Legal Sea Foods in Charles Square for second time this weekend. . . . The cast of “Wicked,’’ now running at the Opera House, was spotted dancing at Cuffs at the Back Bay Hotel. . . . Casting directors with Jerry Seinfeld’s reality show “The Marriage Ref’’ were at the Boston Home Show over the weekend looking for local couples with weird problems.