Is Max surprised to see his father in the freak the mighty

Max is not surprised to see his father. He says that he always thought that this would happen—that he would come back for him.

type of error:

the error in the sentence is a "dangling modifier". a dangling modifier is a phrase, word or clause that "dangles" because there is not target to modify. in this case, "after mopping the floor" is the dangling modifier since it has no word to modify. the noun "house" cannot mop the floor; therefore there is a mistake in the writing of the sentence.