About the characters

- First season 1 episode in which Sissi doesn’t appear.
- Jim and Odd snore.
- Ulrich sleeps with earplugs because of his friend’s snoring.

About errors

- The principal’s eyebrows are grey when we see him.
- The door of Jeremy’s room is brown instead of grey.
- When Aelita runs, the bandages on her legs are identical.
- Jeremy’s map still shows 5 monsters after Odd has destroyed one.
- Yumi’s outfit is reversed when the Megatank falls into the Digital Sea.
- When Jeremy gets annoyed at Odd, the lollies which fell on his keyboard disappear.
- When Odd grabs his skateboard, Jeremy’s scooter is still there, but this shouldn’t be the case.
- The cushion on Yumi’s bed changes colour between when she stirs and when she responds.
- When the return to the past is launched the buildings at Kadic are in sunlight even though it’s night time.
- Jeremy’s computer mouse disappears when he scratches his head and when he has his back turned while listening to Ulrich talk about Aelita.
- Jeremy’s computer microphone disappears when he stresses about the program test and it’s on his left ear when it was on his right earlier when he asks Aelita if she’s asleep.
- Odd’s pants are the one shade of purple before he enters Jeremy’s room, when Jeremy cleans the lollies off his keyboard, when Odd runs with Jeremy and Ulrich, after Ulrich says that Odd will come with him to take care of the bulldozers, when Odd leaves for the factory; his pants become the darker shade of purple when he’s with Jeremy heading for the scanners; the colours are reversed when he talks about his flash vision; they change again when he sees the ceiling collapse, when he sees Ulrich and helps him, then they become the lighter shade before and after Yumi falls out of the scanner.

About the series

- French title: Cruel dilemme

- Odd’s second Future Flash vision.
- Ulrich’s phone number is the same as Yumi’s and Odd’s; 665-225-958!
- A joke circulating includes this episode as the one that begins a long series of misadventures for Yumi, lasting five episodes: “pick on Yumi week” (fallen into the Digital Sea; imprisoned by a Guardian; chased by an alien; targeted by a satellite; chased by samurai armour).
- Jeremy confirms that on Lyoko your only senses are sight and hearing.
- Kankrelats are referred to in this episode as Roachsters.

About references

- Mr Delmas: " Since, as Juvenal said, a sound mind in a sound body!”
Juvenal is a Latin author who lived in the first and second centuries AD. He was, besides being a satirical writer, professor of rhetoric.