One of my fav. actors......and an interesting comment from the peanut gallery.......
I worked as an extra, on the set of Interstellar, and during the set-up, when all the other actors had gone off to their trailers, and their stand-ins were sitting in place so the cinematographer could get the shots right, Lithgow stayed on the bleachers with us, in the blazing hot sun, holding a parasol for the two stand-in kids, and keeping them company the whole time! He could have gone off to his trailer, rehydrated, put on some sunscreen, and whatnot, and none of us would have judged him if he had. But he knew those kids were bored and uncomfortable, so he stuck around. Class act!