I saw that guys video before, but he was way off the mark on a few points. Some things not mentioned about fake GBA carts:
Fake carts still have a tri-wing screw
Fake carts still have "Nintendo" stamped on the board
Fake carts have a slightly different texture then real carts. Real carts feel less smooth over most the surface.
The "GAMEBOY ADVANCE" stamp on carts sticks out a lot more on fakes. It's fairly muted on real ones.
Fake carts tend to have excess plastic at the molding injection point on back of the cart, where as a real one will look polished.
Fake carts don't always seat nicely in system ports either. When plugging one into a GBA they don't "snap" into place, and often protrude from the system even when inserted all the way.
