When the three characters are looking for Astérix (Snoopy), one of the doorbell names is Cassel. Another one is Pujol, which is the name of the assistant director, Henri Pujol, and the first assistant director, Eric Pujol.
There is a documentary called "Ten Years of La Haine" featuring cast and crew commentaries, production footage and deleted scenes. It is only found in the Criterion Collection Blu-Ray version of the movie.
In some English-language versions, such as the 2007 Criterion Collection DVD, the name Astérix was changed to Snoopy in the subtitles, as the film traveled further than the Astérix books did. However, the character is still credited under the name of Astérix in Criterion's booklet and on their website.
When the three guys are looking for Snoopy (Astérix), on the doorbell you have not only the name of Pujol (assistant director), but also Cassel (Vincent Cassel) who plays the main character, VINZ. And the names are next to each on the doorbell.
The story of the man falling and saying "so far, so good" as he passes each floor was similarly told by Steve McQueen's character in "The Magnificent Seven" when asked if his men were ready for combat.