For some sitcoms, Wednesday is the new Monday. “The Big Bang Theory” runs on a Wednesday-to-Tuesday schedule to accommodate our busy creator Chuck Lorre’s other shows. On Wednesday, we read through the episode’s script; Thursday and Friday we rehearse; over the weekend, we’re off to learn our lines; Monday we pretape scenes involving special effects, green screens or tricky makeup; Tuesday evenings, we film before the proverbial live studio audience.

It’s Wednesday—table-read day. Producers, executives, writers and actors...