Financing is the most common source of friction. A lender's final approval can hinge on documentation a buyer did not expect to need, and in a low-supply market a seller is often not willing to extend a condition date to wait for it.
An inspection finding is the second common source, particularly on an older Saskatoon home where a previous owner finished a basement or added a suite without a permit on file. That kind of finding can restart negotiations just when both sides thought the deal was settled.
Whatever made a specific purchase hard, the fix is usually the same: more preparation earlier, not more negotiation later. Get your hand-reviewed valuation from Joel Dyck.