TAHK0 speculated on why the error may have happened, writing, Poke Balls went through a lot of early variations, with everything from the button placement changing, to how it opens differing, to even being depicted with the white on top. It could be that an early Pok Ball design actually did open like it does on the card back, but when the design was eventually changed to the opposite way, they forgot to update it on the card back before going to print, and it remains that way to this day
"One day, or another, perhaps I shall ring my pretty chime
Unlike the Egyptian Gods, Wicked Gods, and Sacred Beasts, the Nordic Gods are different in size with each other
The card benefits a duelist with a Dinosaur-Type deck, like Rex's, but does little for anyone else
for each monster your opponent currently controls that was Special Summoned this turn, it gains 1 additional attack during each Battle Phase this turn