The Two Things You Never Noticed In "Hey Arnold!" Will Fill You With Nostalgia

Calling all '90s kids!

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Remember when Hey Arnold! was one of your favorite cartoons in the late '90s?

Nickelodeon / Via complex.com

You know, the show about the kid living in a metropolitan city, dealing with all of the problems that we all had while being in the fourth grade.

Did you ever notice in the episode "Weighing Harold" that there's a direct reference to SpongeBob SquarePants?

Nickelodeon

This episode aired on April 7, 1999, which was about a month before SpongeBob SquarePants debuted its pilot episode on May 1, 1999.

In that very same episode, the powers that be over at Nickelodeon hit us with another easter egg: A CatDog reference.

Nickelodeon

CatDog was on Nickelodeon for about a year before this nugget appeared in "Weighing Harold," but it's still cool to see the creators of Hey Arnold! reference other Nicktoons by having them appear in other "worlds."

H/t greggy101