After Maggie struck him with a mallet, Homer mentioned that his baby beat him up. In the episode Eeny Teeny Maya, Moe he does get beaten up by a baby and is rescued by Maggie.
Homer and Marge take Maggie's attacks on Homer as being solely influenced by violent cartoons, but as we will see in Who Shot Mr. Burns?, we'll see that Maggie really is capable of premeditated violence.
During the sequence of Marge's letter to the various people responsible for airing Itchy & Scratchy, Krusty the Clown is shown reading it and then flipping the paper around horizontally in an attempt to read it, alluding to his illiteracy, which had earlier been shown in Krusty Gets Busted.
When Roger Meyers Jr. sent Marge a rude letter in response to her complaint, it showed Meyers writing "So let me close by saying—" and then it immediately cutting to Marge reading the letter and saying "...And the horse I rode in on?". This was a reference to a very vulgar expression, known as "[censored] you, and the horse you rode in on."
This is the last episode to air in 1990 and the last episode to be made in that year according to the credits.
Bart writes "Don't" on the "Ban Itchy & Scratchy" sign in red pen. When Bart tells Marge that it's time to go to Milhouse's house, the "Don't" is still in red pen. After a scene with Marge and Maude, "Don't" is written in the same color as "Itchy & Scratchy" - black.
There is a shot of protesters for Michelangelo's David outside the Simpson House. There are two protesters at the front door. The protesters have orange hair (left), and purple hair (right). When Marge answers the door, these protesters are Maude and Helen. Helen's hair color has gone from orange to grey, and Maude's has gone from purple to orange.
During the wholesome activities the children play due to the new Itchy & Scratchy, 3 people are riding scooters. The person on the left has his shirt changing color.
At one point when Marge lifts Maggie away from the TV, Maggie's bow is missing.
When Homer says "what you gonna do?" to Marge, one of his head ligatures disappears.
The scene where Maggie attacks Homer with a mallet is a recreation of the shower scene from Psycho.
Moe's sign during Marge's protest outside Itchy & Scratchy International says "Bring Back "Wagon Train"!", referring to the 1950s-1960s NBC and ABC animated series of the same name.
The music heard while the children are playing outside is the first movement of Beethoven's Pastoral Symphony. It is similar to a segment of the Disney film Fantasia.
This episode is a spoof/satire on the severe censorship against violence on children's television in the 1970s, specifically on how Tom and Jerry (the obvious main inspiration behind Itchy and Scratchy) was retooled as a non-violent cartoon in 1975 due to TV show cartoon regulations of the 1970s and the negative audience reception which followed.