Question: Did they ever hint on this show or Cheers that Lilith was Jewish, before this episode?
Answer: Yes. The 'Cheers' episode 'For Real Men Only,' deals with infant Frederick's bris (ritual circumcision).
Question: There is a laugh track sound about the mention of Julia's book, "Day-Trade Your Way Out of Debt." I've heard of day-trading but don't really understand it. What is funny about the book title?
Answer: Day trading is a risky form of speculation where one can lose a lot of money, and is not a good plan to get out of debt.
Answer: Yes they did hint at it, but her religion was down played because they didn't want that to define her character. But besides the "Cheers" episode mentioned, s10e06 of "Frasier", "Star Mitzvah", is about their son Fredrick's bar mitzvah. Typically under Jewish law, a child is considered Jewish if his or her mother is Jewish (and we know Frasier isn't Jewish). It should also be noted that Lilith is a figure in Jewish mythology and considered to be the first wife of Adam.
Bishop73