In fact, seems to me that is not Intentional, but a mistake!!!
The flag is the flag of England... but in both cases, an error.[i] In Fact, the Open Source institute, in Clarkson University:http://mirror.clarkson.edu/sabayon/
is an American University
(Potsdam, Ney York) http://www.clarkson.edu/ , not in England!.
Really, This is an American Mirror...