Oxygen deprived?

Can oxygen deprivation cause grammatical errors? That’s the question on my mind when I read this excerpt from Yahoo! Shine:

There has to be some explanation for that quotation mark without a match. Some reason the writer thinks the possessive of company is companies. (It’s not; it’s company’s.) Some rationale for using the contraction it’s (which means “it is” or “it has”) instead of the correct its. Some clarification for the missing is in what should be “is loaded.” Some justification for not using a spell-checker to catch the obviously misspelled vitamins.

I can’t think of any reason for these gaffes. Can you?