I do have to say that gold medalist, Maria Dmitrienko, showed remarkable poise and grace in not reacting to the fact that it wasn't her country's anthem playing.
I am amused by the line, which begins at 0:18 in the above video, "Kazakhstan prostitutes cleanest in the region."
The article I linked to (above) also mentioned that the Serbian anthem was wrong. It has a sidebar listing other anthem gaffes. My favorite (among the listed) is described as follows:
Instead of singing "we love your mountains" in his attempt on the Croatian anthem, an English opera singer sings "my penis is a mountain"