Has an Olympic Basketball (Men) game ever ended 78-68?
Exactly once. On January 1, 1964, Mexico beat Canada 78-68, and no Olympic Basketball (Men) game before or since has ended that way. When it happened it was a scorigami, the first 78-68 in league history.
That makes 78-68 the 126th most common final score out of 698 that have ever occurred in Olympic Basketball (Men). One point away, 79-68 has happened never and 78-69 has happened never.