Has an Olympic Basketball (Men) game ever ended 80-78?
Exactly once. On August 20, 2008, Argentina beat Greece 80-78, and no Olympic Basketball (Men) game before or since has ended that way. When it happened it was a scorigami, the first 80-78 in league history.
That makes 80-78 the 126th most common final score out of 698 that have ever occurred in Olympic Basketball (Men). One point away, 81-78 has happened never and 80-79 has happened never.