The Imperial March from The Empire Strikes Back plays while Mr. Burns surveys his monitors in his office. Throughout the series, this is used as a semi-official piece of music for Mr. Burns.
As a subplot in the story, Bart cries 'wolf' to get out of a test, in reference to The Boy Who Cried Wolf. Also befitting the subplot is that Bart is not believed when he is attacked by an actual wolf.
The Spruce Caboose is a reference to the Hughes H-4 Hercules nicknamed the Spruce Goose.
The Krusty the Clown Show audience celebrating loudly along with loud noises when Krusty says "Loud? That's the secret word for the day!" after the wildlife expert says that the Alaskan timber wolf gets spooked by loud noises (and by extension starting the fiasco at Springfield Elementary School caused by the Timber Wolf fleeing the studio from the loud noises) is a reference to Pee-Wee's Playhouse (when in that show, its the same concept whenever someone says the secret word for the day).
The title is a parody and reference to the 1912 Australian comedy film Percy Gets a Job.
Lisa claims that Pierre and Marie Curie both died of radiation poisoning. Lisa is half right: Marie Curie died of radiation poisoning. Pierre, however, died of a skull fracture after getting hit by a horse-drawn carriage.
When Homer points at the donut delivery guy, his right shirt cuff is colored yellow for a moment.
Groundskeeper Willie tore his shirt off when he was about to go one on one with the wolf, but when Willie tells Bart to go back to class, you can see that Willie has a (ripped) shirt on.
During the scene where Homer and the other Power Plant workers are confronting the Donut Delivery Guy, Homer's hat turns from red to blue.
When Mr. Burns is lying on the floor of his office and talking to Smithers about his dream of Marge, the self-portrait behind him shows his right hand resting on a table on the left. Towards the end of the scene, however, the portrait is flipped, with his left hand resting on a table on the right.
The mustache and devil horns Mr. Burns draws on Marge's image on his security screen disappear when he is shown drawing flies around her.
When Tom Jones performs for Marge and Homer, he has a chain on his ankle preventing him from going very far. However, he kisses Marge even though he shouldn't be able to go that far because of the chain.
When the show first aired, Mrs. Krabappel tells Bart that he faked every illness he could think of to get out of taking the test, including Tourette's Syndrome (with Bart snarling, barking, and making inappropriate comments at Mrs. Krabappel). This caused a lot of controversy with viewers, including one who had Tourette's and threatened to sue the show for its unflattering depiction of the condition. When the show reran during the summer, the "Tourette's Syndrome" reference became "rabies" and Bart's snarling and barking was cut. In syndication, the "Tourette's Syndrome" reference was reinstated, but not Bart's snarling and barking. On the season four DVD set and the reruns shown on FXX, the "rabies" line is used, yet Bart's snarling and barking was reinstated. About the only place the original version exists is on English-speaking international versions shown in the United Kingdom, Australia, and New Zealand.
The scene where Smithers, when hearing Mr. Burns ask him if he ever had any dreams where someone they loved flew through the window at night (in reference to Marge), ends up imagining his dream of exactly that, only the person he loved flying through the window at night was Mr. Burns himself, had been cut down a few seconds due to the scene having Mr. Burns landing near Smithers' privates. Similarly, the censors also complained about a particular bump on the bed where Smithers was lying down that suggested that he was having an erection, although the animators revealed that was in fact supposed to be his knee.
The photograph of Mr. Burns meeting Elvis Presley that Burns gave Smithers in Burns Verkaufen der Kraftwerk, is shown on the wall of Smithers' office while he is interviewing Marge.
This episode is referenced in Burns, Baby Burns when Marge mentions that Mr Burns sexually harassed her.