As of this episode, all of The Simpsons episodes would be drawn and animated with digital ink and paint rather than traditional cel animation.
When Sideshow Bob is singing at the end of the episode, the song is similar to the song Stewie Griffin sings about his mother in Running Mates.
When Sideshow Bob is shocked by Marge his hair goes up into a big round Afro like the one he had in early appearances.
The scene were Bart says he's gonna throw a Baby Ruth into the pool is a reference to the in the 1980 film "Caddyshack" were someone throws a Baby Ruth without the wrapper on it in the pool, causing everyone to evacuate out of the pool thinking it's doodie.
Duffman's statement about Duff Stout being "The Beer that made Ireland famous" is a reference to the old slogan for Schlitz Beer (The Beer that made Milwaukee famous).
In the scene where Homer and Bob are chasing Frank Grimes Jr. you can see his cape fall off. Then you see Homer and Bob again. But when you see FG Jr. again, he is still wearing his cape. Then, when he turns into the alley his cape is gone again.
After Moe's pickle jar gets shot, there is a shot that goes to the wall and slowly looks at each picture. When we first see it, there are 6 pictures shown. 2 larger ones on the right side, and 4 smaller pictures vertically down the left side. The picture in question is the large one in the bottom right corner. Originally, it is Moe in Egypt with the jar, and then when they do all the close up pictures, it suddenly changes to a picture of Moe and his jar laying on the beach.