I think you are right. If you read carefully what he said, it was 57 and one more to go. Plus he didn’t get to go to Hawaii and Alaska.
Amazing. I need a new flag. Mine only has 50 stars.
And just a note ... he probably did turnaround and count the stars in that flag, and he got sixty, not fifty! His gaff was an effort to try and figure out the sixty if someone asked specifically.
Save it though. Might be worth something.