Pauline Kael said that Rip Torn could get angrier faster than any other American actor: that he could go from zero to 10 in 1.8 seconds or something like that.
Television is fast and loose. You have two or three takes to get your part right, and if you have a problem, well, by the time you figure it out, everyone's moved on to the next scene. It's good training, keeps you on your toes.