@izzythepush,
Quote:There's nothing wrong in placing a comma instead of a full stop after error either.
With or without the comma, your sentence is incomplete. If you think not, then what is the word you believe is missing from the statement below?
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"It's not like spelling mistakes are your only errors, double negatives and atrocious grammar all mixed up with profound ignorance about the topic in hand."
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I'll fix it for you: It's not like spelling mistakes are your only errors. Double negatives and atrocious grammar all mixed up with profound ignorance about the topic in hand are also an issue.
Or: It's not like spelling mistakes are your only errors. There are also double negatives and atrocious grammar all mixed up with profound ignorance about the topic in hand.