A113 is the room number for the classroom at CalArts when Brad Bird was a student there.
Oddly enough, Bob's voice actor, Kelsey Grammer played Stinky Pete in the 1999 Pixar movie Toy Story 2.
Coincidentally, some of Bob's lines in this episode were used in the Toy Story 2CinemaSins video.
In the town of Terror Lake, Sideshow Bob stays at the Bates Motel, a reference to Psycho.
After boarding the Thompsons' (Simpsons) houseboat, Bob attacks Bart with a machete, a possible reference to Friday the 13thmovies, where the killer Jason Voorhees uses a machete as his primary weapon.
When Ned Flanders jumps out of the bushes and scares Bart, he is wearing a clawed glove with which is used to trim his hedges. The glove is an obvious reference to the Nightmare on Elm Streetfilms, where Freddy Krueger kills his victims in their dreams with a razor-fitted glove.
While the entire episode is a reference to the original Cape Fear film, one scene specifically referenced the 1991 remake. When Sideshow Bob is in a movie theatre, smoking and laughing uproariously, it is similar to the poor conduct of Max Cady (played by Robert De Niro) in a movie house where he laughs loudly at the film Problem Child, annoying the other moviegoers.
Sideshow Bob's knuckle tattoos ("luv" and "hāt") are a reference to the film The Night of the Hunter, in which the murderous Harry Powell (also played by Robert Mitchum) has the words "love" and "hate" tattooed, on his knuckles.
A meta parody of the Opening Sequence is used at the start of act three of this episode, which shows the show's title as "The Thompsons", and also uses a "Couch gag" where they get fish dropped all over them.
The Itchy and Scratchy cartoon is called Spay Anything, refrencing the movie Say Anything, and spoofs the laser scene from Goldfinger.
This episode was banned in Germany for depicting violence against a child and depicting a character holding the ranking of Obergrupperfuehrer (and wearing a complete SS officer's uniform) [the announcer for Up Late with McBain]. Germany has strict laws prohibiting the use of Nazi references and symbols unless it is for educational or historic reasons (i.e., if it is for a documentary). Displaying the swastika alone is enough to get someone put in prison for a year. Nevertheless, the episode was dubbed and finally aired in Germany in 1999, with the first scene edited, making it start with Bart and Lisa receiving mail. Interestingly enough, the phrase "No One Who Speaks German Could Be an Evil Man" received no controversy.
This episode was the last episode produced by the original show writers and runners.
This episode is shown in the 2002 movie One Hour Photo.
This is the first of two episodes in which the opera duo Gilbert and Sullivan were mentioned, the second being The Bob Next Door.
The rakes Sideshow Bob walks into in some scenes seem to be coming out of nowhere.
Although the kids are watching Up Late With McBain (which is implied to be a late night talk show style program), Marge announces mail delivery, which occurs during daylight hours.
The houseboat seems to move on its own down river considering the fact no one is at the control. The current pulls it along.
How did Bart tattoo Homer's butt anyway? It was a joke in itself.
At Springfield Police Station, there is a picture of a wanted criminal with title "Reward" at first and after a few minutes there is a picture of Fat Tony with the title "Wanted".
When Sideshow Bob is listing the residents of the neighborhood who would not be killed, he does not mention Rod and Todd Flanders. Although it must be said that Sideshow Bob probably didn't know about Rod or Todd as is.
When Clancy Wiggum, Lou and Eddie pull out their weapons towards Sideshow Bob at the end of the episode, the guns make shotgun reloading noises despite being pistols.