In the sense that Stinky was using "blighted," the word means "to destroy; ruin; frustrate."
Wolfgang has Auto Shop and Woodworking textbooks in his locker.
The paper towel holder in the bathroom has "HB" carved into it. A possible reference to Harold.
When Arnold opens his locker, one of the things that falls out is a paper titled "My Summer Vacation" that got an A+.
On a previous Friday the 13th, Phil paid a medical student $50 to remove his spleen.
A person can live without their spleen, but that puts them at a higher risk for infections of the lungs and other organs, which they must be vaccinated for to prevent them from getting it.
The title is a reference of the 1980 film Friday the 13th.
Eugene reveals that he was born on Friday the 13th, but it appears his birthday did not take place during the episode.
This may however be that his birthday simply takes place in another month.
A "Mr. Hyunh Goes Country" poster is seen while Arnold and Gerald pass a woman with barbecue sauce on their face instead of cream.
When Gertie is petting one of the cats she's holding, it sounded like Gary the Snail from SpongeBob SquarePants who meows as a snail.
