About the characters

- First appearance of the music teacher Mr Mirti.
- The students sleep during Mr Mirti’s class.
- Sissi discovers the factory again and she took pencak silat classes to impress Ulrich.

About errors

- Odd’s undershirt is missing from his torso when Yumi greets Mr Delmas.
- The heart on Sissi’s shirt is missing when Jeremy comes to.
- The marks on Sissi’s left cheek are missing when she asks what happened to her dad.
- When XANA-Delmas destroys Odd and Yumi’s phones, it’s not Odd’s phone we see but Ulrich’s.
- Sissi talks to Aelita without the microphone before virtualising her and when Jeremy wears it, it changes constantly (wired or wireless)
- When the Scyphozoa steals Aelita’s memory, there’s an improper reuse of scenes, because her memory count is at 300, then back at 900.
- XANA-Delmas’ eyebrows are grey when Odd says “Oh! Visual on the principal" and when he watches the EMP go between his legs.
- Odd uses his phone at the entrance of the factory to tell Jeremy it’s ok to launch the RTTP, but it had been destroyed along with Yumi’s by XANA-Delmas earlier, so he shouldn’t still have it.
- Ulrich tells Odd and Yumi to get to the factory while he takes care of Delmas, but they’re already at the factory, so he should’ve said lab.

About the series

- French title: Ultimatum

- Only appearance of the EMP bomb.
- Second appearance of the GameBoy game Tutur 2000! Nicolas plays it.
- First mention of Odd’s shield.
- New allusion to the series Hospital of Horrors!
- The tunnel Aelita slides down followed by 3 Kankrelats is the same one she and Odd went into to escape Hornets in episode 8, “End of Take”.
- Odd says two precognitive phrases: “Given the temperature, I would g-g-guess somewhere north of Siberia!”
52 episodes later, he and Yumi are Translated (Teleported in the English dub) to Siberia.
And “Uh, in case you didn’t know, cold can kill us too!”
4 episodes later, XANA makes a snowstorm and lowers the temperature extremely to kill its enemies.

About references

- Odd: “Can you give us the CliffNotes version?
CliffsNotes (sometimes called CliffNotes) is the name of a series of study guides available primarily in the US that explains literary works.

- The EMP bomb strongly resembles the EMP bomb from the Matrix trilogy which destroys all the electric systems.

- Sissi makes an allusion to the James Bond films! They’re about the world-renowned secret agent 007, who’s the hero of the action films, who saves the nation, and the world, braving thousands of dangers and seducing beautiful women along the way!

- The principal’s car is probably inspired by a Peugeot 307.