[BillyMac]

Originally Posted by jmwking

"While both teams took their time setting up for the inbound play, it became clear to the broadcast team, the crowd and to both teams that Old Dominion had six players on the court. The referees appeared to be the only ones who didn’t notice."

In my high school games:

NFHS 10.2.2 SITUATION: With Team A leading 51 to 50, a held ball is ruled. A6 properly reports and enters the game. A time-out request is granted to Team B. The clock shows two seconds remaining in the game. After play is resumed by a throw-in, the officials: (a) recognize that A has six players competing, but cannot get the clock stopped; or (b) do not notice Team A has six players on the court. Following the throw-in, time expires. Team B now reports to the officials that Team A had six players on the court. RULING: In (a), since one of the officials had knowledge that Team A had six players participating simultaneously and this was detected prior to time expiring, a technical foul is assessed against Team A. In (b), since it was not recognized by either official, but was called to their attention after time had expired, it is too late to assess any penalty.

From the IAABO Sportorials November/December 2017 issue, article entitled Rules Interpretations and Clarifications from NFHS In-Person Meeting With Theresia Wynns, NFHS Basketball Rules Editor:

More than five players on the court not observed by officials: If Team A has more than five players on the court during a live ball and the officials do not realize it, should the officials charge Team A with a technical foul if the scorer notifies officials of the infraction during the next dead ball period? Answer: No. An on-court official must observe the excess number of players on the court during a live ball and a team having more than five players on the court during a live ball shall be penalized only if the infraction is discovered while being violated.

Participate? 10.5.3 SITUATION: A5 has just received his/her fifth foul of the game. A5 (a) is erroneously permitted to remain in the game for another two minutes before the scorer realizes the mistake; or (b) leaves the game after the coach is notified of the disqualification. At the intermission between the third and fourth quarter, A5 reports as a substitute and subsequently enters the game. RULING: In (a), as soon as the error is discovered, the player is removed from the game, no penalties are assessed. In (b), A5 will not actually "participate" until the ball becomes live. If detected prior to the ball becoming live, A5 would be directed to the bench and no penalty assessed unless the official deemed it was a deliberate attempt to circumvent the rules. If detected after the ball becomes live, it is a technical foul charged directly to the head coach resulting in the loss of coaching-box privileges. The player is immediately removed from the game and Team B is awarded two free-throws and the ball. (2-11-5 Note 2)