I think the misspellings are due to GNP getting the track names from the cue list for the episodes, where they were misspelled and hand-written.
The producers of this set took their cue titles from the score manuscripts, I believe.
I suspect Disc 4 will start with the remainder of the season 1 episode scores, and maybe start and end with the "Remastered" main and end title re-recordings for season 1.
Disc 5, I predict, will be the library cues recorded for season 1, as well as other odds and ends, some of which have never been heard.
Then seasons 2 and 3 would follow the same general pattern.
What is clear is that there was attention paid to the listening experience in arranging the CD contents.