"Observer Effect" is a nice lead-in to "Errand of Mercy" more than a century later, but it makes one wonder why it takes the Organians another 110-odd years to decide to make another contact with humans. I guess to each species their own.

uhh as i referenced in my post there were contacts with humans in fact it sounds like the federation before errand of mercy.
it had been visited but because everyone believed this to be true
the visits may not have been that frequent.Little of intrinsic value
it is because of its location that it became important as war loomed.
once spock and kirk go to the planet the oddities start..
spock..
and this bothers spock.. a lot for him.Whatever it is, it would seem to be inconsistent with the reports we've been given on this culture.
Captain, our information on these people and their culture was not correct.
evidently the organians were playing with the earlier survey teams.