Only adults notice these things in Hey Arnold! For this list, well be looking at themes and references from this Nickelodeon show that you might have to be a little older to understand unless youre a sophisticated child like Arnold. Our countdown includes Woodstock, isolation, child neglect, and more! Which moments made YOU say, Hey, I get that now? Let us know in the comments!

Watch more great adults only videos here:
Top 10 Things Only Adults Notice in Animaniacs - https://youtu.be/iP0tuzwoYAU
Top 10 Things Only Adults Notice in Kids Movies - https://youtu.be/EE7gv_KdjH8
Top 10 Adult Jokes You Missed in Rugrats - https://youtu.be/ckd-XPjJ3B4

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