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As Indy_Ref said, 2.11.10D.
It says "Once the ball becomes live in the overtime, the overtime will be played even though a subsequent correction of an eror or mistake changes the score."
The point of no return is the live ball for the overtime (or the approval of the score, if not a tie). This does seem a little contradictory in that a T after the buzzer for the 4th quarter, but the it is not. In the case of a T, the 4th quarter actually ended in a tie and a overtime is required. In the case of a mistake, the 4th quarter did not end in a tie, it just appeared so until it was corrected.
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