Foster's Home for Imaginary Friends Easter Egg - Mario and Luigi?

In the episode "The Buck Swaps Here" when Eduardo is running from everybody and runs past the two Italian people carrying a mirror, take a close look. One is kinda short, plump, and wearing red overalls with a red hat and a mustache, while the other is tall and wearing green overalls and a green hat and a mustache. This is VERY similar to the well-known Mario Brothers: Mario and Luigi