About the characters

- Jeremy, Ulrich and Odd are in class 8B.
- Sissi threatens to kick Nicolas and Herb out of her group if the latter loses to Jeremy; what a great friendship!
- Only episode in which XANA messes with the connections on the factory computer.

About errors

- The tower in this episode, on a rotating platform, has a power cable which goes through the ground but doesn’t leave the platform. It’s therefore not connected to the other towers or to Sector Five.
- The buttons on Ms Hertz’ lab coat disappear in one shot.
- The lift button is in the wrong place when Odd enters and when the doors close.
- The bar on Iron Sissi’s head is black instead of yellow at the moment when Kiwi 2 catches the ball first.
- When Herb tries out his robot in his room, it’s not his feet we see but Jeremy’s.
- The factory microphone is in Jeremy’s other ear when he tells Aelita that he’s sent Odd as reinforcements and disappears completely in the following shot.
- Thomas Jolivet’s hair changes between the moment where Yumi and Ulrich burst out laughing and where Ulrich tells Odd that they’ll tell him everything.
- Aelita’s outfit is reversed when she types in the Code Lyoko.
- Jim announces at the end of the robotic competition that class 9B [sic] has PE class, but later in the change rooms, we see Christophe M’Bala who’s in the year above.
- Jim says that class 9B has PE, which is supposed to be the class Odd, Ulrich and Jeremy are in, but they are in fact in year 8. This isn’t the first time they’ve mixed up the students’ year groups, another being episode 10, “The Girl of the Dreams”.
- Odd’s pants are entirely the darker colour when Jeremy says that the robot has damaged the terminal, and the colours are inversed when he tells Jeremy he’s going to beat Herb, when he connects the two cables and during his transfer.
- Herb’s hair is entirely black during one shot in Ms Hertz’ class, while Sissi is being annoyed at him, when he’s happy to have destroyed Kiwi 2 and when he welds the little robot which deactivates XANA’s robot.
- The principal’s moustache and eyebrows are grey when we see him and the students applauding, when he says he’s never seen a robot so ugly, when we see one of the photos taken and after the RTTP.
- The marks under Nicolas’ eyes disappear when he cringes after Sissi gets annoyed, when Odd says that Jeremy is going to beat Herb, at the moment when Odd calls Herb a sore loser and before Sissi berates Herb.
- One of the four doors of the science buildings is open when Yumi and Ulrich stop running, when they were closed before.
- During Ms Hertz’ class we can see Anne-Sophie Munier, Anouche Bedoyan, Ninon Coste, Veronica Fayolle and Julie Vigouroux from year 6, and Emilio Rodriguex, Lola Keiffer and Tristan Brossard from year 7. They often change places. Finally, Ninon’s hair is blonde when Ulrich tells Jeremy that he’s ready.

About the series

- French title: L’âme des robots

- First appearance of Kiwi 2, a robot made by Jeremy which reappears in episode 86, “Canine Conundrum”.
- Second time XANA takes control of the assembly lines in the factory, along with episode 14, “The Trap”.

About references

- The robots XANA creates strangely resemble “Terminator,” the metallic cyborg from the saga of the same name.

- Ms Hertz: “As I’m sure you’ve noticed, this sheet of titanium is much stronger than steel, which is why it is used by NASA for constructing its space shuttles!”
NASA (National Aeronautics and Space Administration) is the government administration responsible for the USA’s space programmes.

- The name of Herb’s robot, “Iron Sissi,” sounds a bit like Iron Man, a hero in comic books.