Daniel Radcliffe pays homage to Maggie Smith, who died at the age of 89. The two actors have appeared in previous “Harry Potter” films. Radcliffe played the titular character in all eight films, while Smith played Professor Minerva McGonagall, the head of Gryffindor House and the deputy headmistress of Hogwarts under Albus Dumbledore, in every “Harry Potter” film save “Harry Potter and the Deathly Hallows – Part 1”.