There is another situation where a change can be made. If the down is incorrect it can be corrected at any time until that series ends.
5.1.1 SITUATION A: What procedure is used to correct an error if it is discovered: (a) a fifth down has been run; or (b) A has not been given its allotted four downs? RULING: In (a), if the referee determines a team has been given a fifth down, play will revert back to where it was before the fifth down was run. However, once a change of possession occurs or a new series has been awarded, no change can be made. In (b), the number of the next down can be corrected until that series has ended.
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