Hubbard dated everything. The penmanship in this document is poor. Hubbard switches between cursive and printed styles seemingly at random. It's hard for a lay reader to see why emphasis is needed here. Note that Teegeeack and Earth are not underlined.
Dictionaries list both spellings.
He does not appear to be a bad speller. The heavy use of parenthetical interjections gives the page the tone of a verbal report, but examining the actual document shows that a couple of these were inserted later, so this cannot be a verbatim transcript. Two other insertions are noteworthy. The visual appearance of this comment shows that it could not have been inserted later. On the other hand, it is ungrammatical, suggesting that Hubbard realized the ambiguity at the moment he finished the preceding line, and stuck in the parenthetical comment to resolve it.