Mordechai is portrayed as a faithful Orthodox Jew, but during a scene with his shirt off, the morning after Mordechai and Esther make love, it's clear that Mordechai has several tattoos, which are forbidden in traditional Judaism.
Adam Goldberg has stated in interviews that the only reason for this is that he was too lazy to get up early in the morning to have the makeup artists cover up the tattoos. The tattoos go without comment in the dialogue because, according to director
Jonathan Kesselman, the Hebrew Hammer has already gone against tradition by engaging in premarital sex, and so a couple tattoos are nothing compared to that.