Well, I think we're in agreement.
If someone in the household could write, the enumerator would be transcribing from the household schedule, so any errors would be transcription errors ... either a straight mistake by the enumerator or an error resulting from misreading of poor handwriting.
My understanding is that, if there was no literate member of the household, the head of the household was supposed to seek help from friends or neighbours, and the enumerator recording verbal information was therefore a last resort.
So, the question comes down to whether Mr. Lines/Lyons was literate. A copy of the marriage certificate would probably answer that question. But ... without being totally sure what a "General Dealer" is, I would have thought that some level of literacy for stock-taking and the like would be necessary in that line of work.
Cheers
Tim