This isn't exactly new, but I couldn't find any interviews or clips where Scotty McCreery spoke about this, so I asked him.
Back in the day, Scotty sang the national anthem before game 1 of the 2011 World Series. If you skip ahead to the 2:56 mark, you'll hear what got peoples panties in a bunch. Did he say "no Jose" or "oh say?"
Here's my interview where we discuss the anthem, who would be on his country music Mount Rushmore, among other things.
You can also listen here if the video below doesn't work.