Ultimately you can spot a 141 "failure" in someone's logbook. The schools would have to get REALLY devious about trying to cover those up...basically no logbook entries for "incomplete" checkrides.
Not if the student didn't pass the oral.
Also if the FAA makes 141 failures reportable, they would be documented just like 61 failures and the DPE's would be putting THEIR ticket on the line if they covered it up.
DPEs do not administer stage checks. A school examiner who happens to be a DPE can administer a stage check.
141 stage checks are NOT the same as check rides. A failed 141 stage check is NOT a failed check ride.
Sorry to bust on you Rick.