My favorite bit of trivia concerning the Trimline is the dial. They ran into a bit of a problem. There was only so far they could shrink the dial face. Any smaller and people couldn't get their fingers in the holes. They tried several ideas, including having spokes instead of holes (users' fingers slipped out of the spokes too easily). Finally they realized that by making the finger stop slightly moveable instead of fixed, they could eliminate the space between zero and one on the dial face. That let the designers shrink the dial just enough to give us the rotary Trimline handset that fits so nicely in the hand.
