Grammatical mistake is a mistake in framing a sentence, which could be spelling error, punctuation, etc. The mistake in the sentence is the word way too many, it could be a lot of.
Error is the deviation from the standard rules of the language made by second learner of the language.
It may be of any type, like, error while framing sentence, spelling error, mismatch, etc.
Thus, in the sentence "My game plan for the weekend is to lay on the couch and watch way too many nature documentaries.", the mistake is in the word way too many, instead of this one can use a lot of.
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