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

Calling all '90s kids!

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.

Get ready to take a trip down memory lane because there were two nuggets you probably missed while watching the show all those years ago.

Nickelodeon / Via blog.materialgirlcollection.com

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.

Still not impressed?

Nickelodeon / Via mashable.com

Well, there's more.

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."

MIND BLOWN.

Nickelodeon / Via classandtrashshow.wordpress.com

It's OK. Rest up, '90s kids.

H/t greggy101