The 403 error is an error page which pops up if a user tries to access a restricted page. It has not been upgraded unlike the other error pages as it still holds the line, "Oh noes! Our server is Scratch'ing its head!", and the Scratch Cat used on the previous 404 Error.
The error can be viewed here.
It has been changed to Giga holding a magnifing glass in the 404 error.