Other mistake: Near the end of the movie, there is a party scene in which Jessica and her ex-boyfriend are talking on the roof of the building. Behind them is a sign posted by the door to the roof. The letters are reversed, as if you're reading the sign through a mirror.
Kissing Jessica Stein (2001)
1 other mistake
Directed by: Charles Herman-Wurmfeld
Starring: Jennifer Westfeldt, Tovah Feldshuh, Esther Wurmfeld, Heather Juergensen, Hillel Friedman
Revealing mistake: When Jessica and Helen are arguing outside the dress shop, there are 2 girls crossing the street in the background who blatantly stop to watch the scene.
Helen: Some people smoke pot, some people bungee jump, some people chant. What do you do to be happy?
Jessica: Nothing. I'm not.