Question

fix the pronoun error (if one exists).
mike wheeler painted a mustache on all of the portraits and then hung it back on the wall.
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Explanation:

The noun "portraits" is plural, so the singular pronoun "it" does not agree in number. We need to replace "it" with the plural pronoun "them" to match the plural antecedent.

Answer:

Mike Wheeler painted a mustache on all of the portraits and then hung them back on the wall.