Hey Arnold in other shows/media

I recently found out that Grandpa Phil made a cameo appearance on an episode of the new Nicktoon "The Loud House":



And it made me remember the Helga cameo in an episode of The Angry Beavers called "Dumbwaiters":



Were there any other references to HA! out there? I'm pretty sure those are the only two examples from Nickelodeon shows but I remember reading on the old Arnold's Room forum that someone mentioned it in passing on a sitcom or something.

A storyboard artist for "The Loud House" also posted this on his tumblr:



I'm really digging all these old school refs in The Loud House and the art style actually makes me sort of interested in the show.  I feel like if it gets a fandom it's gonna end up with a weird ship base though since it's one boy and all his sisters......

These are pretty interesting (Although I am not interested in The Loud House, I thought this was pretty interesting).

I don't recall any references to HA on any other shows, but with the mention of the Helga face cameo on "The Angry Beavers", I do remember that they used Yahoo Soda, the same soda from HA

I wonder if Family Guy has ever made any jokes about Arnold, being that him and Stewie both have football-shaped heads