This may be common knowledge but it seems to surprise a lot of people when I share it with them. Not quite a “TIL” but interesting trivia nonetheless.
Dark Exeggutor from Neo Destiny prominently misspells the Pokémon’s name as “Exeggcutor”:
WotC had famously spotty quality control and they were really rushing to meet release schedules around this time. This card leaves a strong impression on me as the most emblematic of needing to just get it out the door. WotC made lots of little mistakes over their years, but getting a Pokémon’s name wrong like this is the most egregious to me. Although perhaps that’s rather anglocentric of me since other languages fell victim to this sort of thing too.