Disowned Adaptation: Albert Uderzo didn't like the film. He found it too mired in the "Canal Spirit" ("L'Esprit Canal", the brand of humor of the French TV channel Canal+, of which Alain Chabat was of one the patron saints) and way too far from the spirit of his comic books.
Getafix's role also went from Claude Piéplu to Claude Rich.
Throw It In!: Edouard Baer improvised Otis' famous speech. "There's no good nor bad situations..."
Unintentional Period Piece: The film is a major offender today. Examples that stand out include a joke about early 2000's cellphones, and the presence of humorist Dieudonné M'Bala M'Bala, when he wasn't yet making extremely controversial/offensive one-man-shows and statements on a regular basis, which had him permanently banned from French talk shows and movie productions.
It was a smash hit in France upon release, currently the 11th biggest success there with 14,559,509 cinema admissions.