Has an NBA game ever ended68–66?
Yes, 6 times.

Every 68–66 game (6 times)
- December 12, 1997Utah Jazz 68, Dallas Mavericks 66
- January 24, 1954Milwaukee Hawks 68, New York Knicks 66
- November 3, 1951New York Knicks 68, Milwaukee Hawks 66
- April 8, 1950Minneapolis Lakers 68, Syracuse Nationals 66
- November 8, 1949Minneapolis Lakers 68, Washington Capitols 66
- November 1, 1946New York Knicks 68, Toronto Huskies 66