Thanks for the help, guys. I hope we can compile a good list in time for one of the newly-announced patches on the way from Stardock.
Addendum to
Galaxy setup: Power Duel desc."Drengin" should be capitalized in, "This is the ultimate test of the human vs. Drengin wars because..."
(I wasn't sure at first, but this is the way the word is used in every similar context.)
Campaign: Twilight of the Arnor (Arnordämmerung?

)
I. Of the Arnor:
Error: "...that has occurred over the past 2 years while her and her crew were gone."
Correction: "...that has occurred over the past
two years while
she and her crew were gone."
(The "two" is to keep with the paragraph that follows, in which the word rather than the numeral is used.)
Correction, paragraph 3: "The Drengin Empire
was able to quickly overwhelm the Terran Alliance and
its allies..." (from "were" and "their")
(I haven't played through the campaign as yet; any help from keen eyes would be appreciated in this regard. Also, I know the Dark Avatar campaign contains some mistakes, as well. The Dread Lords campaign seemed fairly solid, though, from a transcribed copy of the mission descriptions I read online; verification would be welcome, however.)
Tutorials: (All descriptions refer to the column left of the video player.)
Your first turn:
Correction: "An introduction to what you can expect
your..." (from "yoru")
Viewing the Galaxy:
Correction: "...as well as different ways
to view your empire. (from "view to")
Negotiations:
Correction: "...and negotiate with
/other/ alien leaders..." (Best to remove "other," since one wouldn't consider his own species alien!)
Custom Races:
Correction: "If none of the pre-designed races appeal to you, this
tutorial..." (from "tutorials")
To be continued. Next, Tech Trees, beginning with the Terran Alliance.