While watching Where Silence has Lease, during the battle with the Romulan ship, I noticed that on the helm and ops stations the lower screens (for lack of a better word) also flash red during a red alert. Never noticed it before. It is faint, but you can see it.
I'm noticing more details too.
I'm not sure if this is new or something that's always been there, but watch the transporter effect when the away team is dematerializing off the transporter pad. As the actor disappears, you can notice a slight ripple effect similar to a ship cloaking.