Trivia: In the story where Homer get transported to the 3rd dimension there is a string of hexadecimal numbers floating in space. The string reads: %46%72%69%6E%6B%20%72%75%6C%65%73%21. If you paste these into your browser address bar you can see that these convert to say 'Frink rules!'
Trivia: In the segment Homer3, you can see at one point in the background of the 3-D world a tea kettle. This is a reference by the animators to the first object ever digitally animated into 3-D, a kettle. You can also see the number 733, which if you look on a normal phone it spells out PDF, the software they used to make the sequence. There's a special on these on the 7th season DVD's.
Trivia: Bart changes the lyrics to Iron Butterfly's "In-A-Gadda-Da-Vida" to "In the Garden of Eden." This was in fact the original title of the song, but because Ron Bushy had difficulty listening through a headset, he misinterpreted the title. It was not due to Doug Ingle being drunk while singing, as the popular rumor has it.
Trivia: When we are first introduced to Sideshow Bob, he is building a ship out of sticks. Look at his name tag. It says A-113 on it. A-113 is the classroom number used by character animation students at CalArts, frequently used as an inside joke by graduates, right the way up to Pixar movies.
Trivia: In this episode, Wolfcastle says "Real acid?" and starts to have doubts about filming the scene. In The Terminator, Arnie (who Wolfcastle is a parody of) said the exact same thing when he learned that the crew were going to pour acid on his clothing for a smoke effect.