When Cleveland introduces Mr. Farber to Young Soon Choi, Heep says her apartment is 8A. But, later when Cleveland goes to Choi, the door number reads 16B.
Shyamalan based the film on a story he told his children. This aspect of the production was questioned frequently, with one critic saying that if Shyamalan based his films on kid stories, he should go make films for Nickelodeon. Ironically enough, 4 years later he released "The Last Airbender" for Nickelodeon, which was considered to be one of the worst films ever released.