1. Watch the ending credits, sometimes they have some pretty screwed up things going on. One writers name is always upside down, sometimes the credits have messages in them too.

2. In the episodes Brilliant Number One and Two, they are the same exact cartoon, except the difference is when the screen turns to black and white and the barely readable white writing flashes at the bottom. Number one's writing is all William Shakespear's words, Number two's episode is all of the poet W.S. Merwin's words. These are the two most bizarre shows I have ever seen on a cartoon.

3. In a lot of shows the characters will mention one of the writers names while talking to a guest or when they are involved in dialogue, such as Zorak mentioning the name of a writer or producer while talking to Jerry Springer and tells him that they gambled with him in Vegas.