• In "McFists of Fury" it is revealed that Heidi owns a secret piggy bank, which Howard used to buy his McTop.
  • She can sing and play the guitar as seen in "30 Seconds to Math".
  • In the overview of the pool in "House of 1,000 Boogers" Heidi can be seen twice.
  • She has won the Battle of the Bands many times before.
  • Her show is sponsored by McFizzles in "Night of the Living McFizzles".
  • She was the one responsible for the Norrisville High Talent Show in "So U Think U Can Stank".
  • She is the host of the Word War I rap battle in "Hip Hopocalypse Now".
  • Heidi is similar to Jazz Fenton from Danny Phantom and Candace Flynn from Phineas and Ferb because they are both bossy teenage girls, both redheads, and they are both older sisters to the main characters (on the other hand, Heidi is the sister of the protagonist's best friend, unlike Jazz and Candace).
    • She is also similar to Lois Lane and Vicky Vale from the DC comics. They're both reporters and they have a lot of appreciation for their respective heroes.
  • Heidi's worst fear is looking like her mom when she is older - fat and slow.
  • When Howard tells everyone to act natural as Bash comes over in "Pranks for Nothing", she does hand gestures.
    • ​Later, the Prankzooka turns her cellphone into large speakers.
  • According to a Tumblr post by RC9GN animatic editor Nico Colaleo, Howard is Jewish, meaning Heidi is also Jewish.
  • Heidi is one of the only recurring students that never got stanked by the Sorcerer.

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