For example, an opponent who gained 2 life and lost 1 life in the same turn still lost life that turn
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
Toss in an extremely heavy focus on Loot and perhaps the most hideous special treatment ever designed, with now infamous piss yellow borders, and the end result was a set that ended up being more meme than Magic
A card in perfect condition can be worth three to ten times more than the same card with visible wear
This chart is for generation one and two
Creature - Cleric Orc Zurgo Stormrender Mobilize 1 (Whenever this creature attacks, create a tapped and attacking 1/1 red Warrior creature token