A shared driveway without a registered easement is a real risk, since a future owner on either side is not bound by an informal understanding and could restrict access or demand changes. Your lawyer should confirm the arrangement is properly registered, not just described in the listing.
A fence line that does not match the surveyed property boundary is a separate problem. Your agent should ask whether a real property report or survey certificate exists, since a fence built onto a neighbouring lot can become a dispute at resale even if nobody has raised it in years, and resolving it later can cost more than the legal fees, typically $800 to $1,500, of catching it now.
None of this shows up in listing photos, which is exactly why the title and survey documents matter more than a walk around the yard. Get your hand-reviewed valuation from Joel Dyck.