Phineas states that the shopping mall they're at has "52,637,000 square acres". Two mistakes: 1) the unit "acre" is already a unit of area, so it's incorrect to say "square acres"; 2) disregarding the units, 52,637,00 acres is approximately the size of Kansas, or the country of Austria. (For comparison, The Pentagon, the world's largest office building by floor, is only 149 acres, or just under 1/4 mi² or 3/5 km².