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A number of previous episodes were referenced in this one. First when Casey asks Billy his pet peeve he says "chain letters", this refers to the episode "Billy Breaks the Chain" where Billy was sent a chain letter. When Lisa is apologizing to Casey she brings up a few more. She talks about her dad's wedding which happened in "Noel Buys a Suit", the time they did a paper together in "Lisa Makes the Headlines" and the time they had a rabbit in "Casey Draws the Line". Also the time that Griff and Lisa went on the bad date is brought up (which has been mentioned a few times since then) which happened in "Connie Makes a Catch".
We find out that Griff's real name is Robin Griffiths and that Griff is a nickname.
Goof: When Connie is delivering newspapers the first time she picks one up and the rocks fall off the wagon and when she goes back they are back on top of the papers. The next scene the rocks are completely gone.
In this episode we learn that Chuck and Pete's dad is in a halfway house, even though they say he is in Jail.
Goof: Leon thinks that Lisa sold Martin the fake vomit, but it was actually Pete, and Martin never corrected him, even when they were right there. Also, Lisa never told them that it was Pete.
Goof: Lisa types on the typewriter the line about a thief and yet in the newspaper it looks like it was handwritten.
The title card that shows during the episode leaves out the word "the" in the title and is simply called "Cookie Goes to Hospital".
Goof: In "Ida Makes A Movie" Cookies doll gets thrown into a garbage truck and destroyed, here (and in subsequent episodes) her doll is back.