heyarnold.wikia.com

Be9k TIL that after the Hey Arnold episode titled “Arnold Betrays Iggy” was released on television, it received such negativity from fans and critics that series creator, Craig Bartlett, along with the show writers wrote out apologies for how terrible the episode was.
wKE6 TIL That Helga’s mom in the Nickelodeon show “Hey! Arnold” was an alcoholic.
W7AA TIL That a spin off of ‘Hey, Arnold!“ was pitched focusing on a teenage Helga. It was rejected by Nick for being too dark and by MTV for being too much like Daria.