I have heard that Int'l applicants tend to require higher GMAT than domestic applications to be competitive at the top schools. E.g. Domestic applicants can have their GMAT around the average or slightly below it. But Int'l applicants better have 750+ to be competitive. The is due to the general unfamiliarity with some of the universities overseas.
For other things like
LOR,
SOP and experience, I guess the high standards are demanded from all applicants regardless of their nationality.