Its probably been bought up before so sorry for that
I love watching all the ST eps from all the series but more so TOS and the TNG, the rest thereafter. I noticed that the crew of Kirk's Enterprise are more relaxed and casual on the bridge, how many times have we seen coffe cups on all the computer coms with each of the crew with a blue styrene cup next them, even Bones has one in his hand if there and at times food being eaten. You never see this on the other series (not that I've seen?). There must be other casual happenings but these are the two that I can think of.

I love watching all the ST eps from all the series but more so TOS and the TNG, the rest thereafter. I noticed that the crew of Kirk's Enterprise are more relaxed and casual on the bridge, how many times have we seen coffe cups on all the computer coms with each of the crew with a blue styrene cup next them, even Bones has one in his hand if there and at times food being eaten. You never see this on the other series (not that I've seen?). There must be other casual happenings but these are the two that I can think of.