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Dan Aykroyd chats with ET's Rachel Smith at the New York City premiere of 'Ghostbusters: Frozen Empire,' in theaters March 22. The actor reacts to 'Ghostbusters' franchise producer Ivan Reitman's death, saying he would be 'really happy' and proud of his son, Jason, who produced this new film. Plus, Dan reacts to Dylan O'Brien playing him in the upcoming 'SNL 1975' film.