The movie offers one peculiarity after another. The director’s cut edition foregrounds the supporting character of Tesla, if only to explain the audience his relationships to Edison and Westinghouse. (The scene where Tesla’s upbraided by his boss as a measly “immigrant” wasn’t in the original cut.) The current and much-loved “Spider-Man” headliner, Tom Holland, plays another secondary character, Edison’s devoted assistant Samuel Insull. He comes into prominence late in the game; as Marguerite Westinghouse, Katherine Waterston does a lot with a little. Smart actors, and this ensemble’s full of them, know they needn’t do a lot of extraneous anything with elegant Gilded Age period costumes handling so much of the work for them.