

Getafix's grandfather, who appears in the movie, is not mentioned in any of the books.In the film, Prolix manages to escape with stolen gold (which he conned the villagers into stealing from the Romans) and is not seen again, whereas in the book Prolix was ultimately exposed as a phony when the Gauls managed to surprise him (thereby proving he couldn't really see the future). The fraudulent fortune-teller Prolix is based on the character of the same name in Asterix and the Soothsayer - like in the book Asterix is the only villager who doesn't believe his false prophecies.In the movie Detritus appears to be more based on Crismus Bonus from Asterix the Gaul or Felonius Caucus from the book Asterix and the Big Fight. In the book Asterix and the Roman Agent, a character named Detritus (in the original French version) was an agent of Caesar who was a master of manipulating people.Such a short time limit is not implied in the original books, wherein the potion's effects can last for several hours, such as disguised legionary Caligula Minus holding a rock up for several hours in Asterix the Gaul or crooked adviser Codfix retaining superhuman strength until well into the daytime after drinking a ladleful of potion at night in Asterix and the Great Divide.


It is revealed early in the film that the magic potion used by the Gauls only lasts for ten minutes.Caesar is returned to power, and grants the village its freedom. To defeat him, Panoramix brews a special version of the potion which creates dozens of duplicates of Asterix and Obelix. Caesar co-operates with the Gauls to defeat Detritus, who mounts an attack on the villagers using his own magic potion.
