About the characters

- According to Ulrich, Sissi takes three showers a day.
- Sissi’s real first name is Elisabeth, but she doesn’t like it…
- Odd eats eggs at breakfast.
- Ulrich is terrible at history.
- First mention of Mr Chardin.

About errors

- Aelita’s outfit is reversed at the moment when she arrives in the room with Creepers in it.
- Odd has a blue towel and Ulrich green. When Aelita enters the boy’s bathroom, during one shot, their towel colours are reversed.
- The colours of Odd’s pants are inversed when Ulrich tells him “Oh shoot” and they become entirely the darker shade of purple when he closes the lift door.
- The factory microphone disappears from Jeremy’s ear in two shots, also the microphone keeps changing (wired or wireless).
- At the end before and after Aelita says to Sissi “You might just sprout a brain” and the following shot shows the heroes laughing, it’s daytime outside Jeremy’s window though the action took place at night.
- We notice Jean-Baptiste Pujol in front of Aelita in the line to the girl’s room even though he’s a boy. He was also shown near the front of the line in an earlier shot in his regular clothes minus his jacket, then teleported to the back of the line in his pyjamas and holding a toiletries bag.
- When Sissi tells Aelita about the empty shower room upstairs (which should be downstairs), her hair disappears below her arm.
- When Aelita leaves the line to go to the boy’s showers, her sleeves are the same colour as her skin.

About the series

- French title: Terre inconnue

- Some confusion has arisen about the spelling of this episode's title. “Unchartered territory” denotes an area that is lawless, irregular or unauthorised, whereas “uncharted territory” means an area that hasn't been recorded on some kind of map. With regards to Sector 5, both words are applicable.
- First allusion to Franz Hopper.
- First use of the delayed virtualisation program.
- First episode starting with Aelita’s dream.
- Allusion to the previous episode about the discovery of the Hermitage.
- Jeremy devirtualises the heroes for the first time without them losing life points or a return to the past.
- Odd: “Sissi’s such a brat! And to think you guys actually kissed once!”
Allusion to episode 19, “Frontier” in which Ulrich kissed Sissi so she’d get Yumi out of her father’s office.

About references

- The code Scipio refers to General Scipio Africanus, a Roman officer who led the troops in a final assault against Carthage. He landed in Africa and allied with the Numidian king to crush the Carthaginian forces in the battle of Zama in 222. Carthage was razed and the area was salted so that nothing would grow there.

- Jeremy : “Physics text books; Frank, Heisenberg, Schrodinger…”
All three of these people were physicists.
Frederick Charles Frank is best known for his work on crystal dislocations and the idea of the Frank-Read Source of dislocations. Proposed the cyclol reaction in the mid-1930s.
Werner Karl Heisenberg was the founder of quantum mechanics, won a Nobel Prize in 1932.
Erwin Schrodinger developed a number of results in quantum theory, which formed the basis of wave mechanics. Well-known for the Schrodinger’s cat paradox that criticised the conventional Copenhagen interpretation of quantum physics.

- Scyphozoa is a class within the phylum Cnidaria, which refers to a type of jellyfish. The name comes from the Greek word skyphos, denoting a kind of drinking cup which the organism resembles.