As long as we are splitting hairs ...

The Punnett's square is actually a representation of the odds for each egg, not a guaranteed distribution of the clutch. You aren't guaranteed 1 albino every 4 eggs from het X het any more than you are guaranteed that 2/3 of the normal looking ones will be hets. You might get more or you might get less. With a large sample those ratios would probably come pretty close but with small clutch sizes they might not.