When is Set Over? Too Late to Correct Error?

[pavbref]

I have had this happen in the boy's season last year. The scorer missed a point after a substitution earlier in the set, told me that the score was 24-23, and I indicated match point to the R1. There was not a time-out in this set to allow checking the score sheet, and after the team scored what we believed to be the 25th point, I checked the score sheet and discovered the missing point. We put both teams back on the court, had a line-up check using the score sheet to ensure that everyone was in the proper position, and played one additional point.

The primary point to take out of this is to always check the score sheet at every chance you get to prevent an awkward situation at the end.