I'm participating in a scavenger hunt and have been given a riddle to find the next set of clues. The riddle says that the next set of clues can be found at "the returns of Chrysler's cruiser, in the year of the original Rich Brook fall.  (Which is on Rincewind's unspeakable level of the Jewish star-sun.)"
Unfortunately, I've only read a single Discworld novel, and that was many years ago. One of my close friends is a fan, though, so I know Rincewind is a failed/incompetent wizzard (Wizzard?). My friend, though, didn't know what the clue was talking about. It's possible that it's referring to a very obscure or off-the-cuff line/subplot.
I was hoping, though, that you lovely fans would be able to help! I don't expect anyone to understand the first bit, but hopefully someone out there will know what on earth
"Rincewind's unspeakable level of the Jewish star-sun" means.
If it helps, the video with the full (melodramatic and, I'll happily admit, rather annoying) riddle can be found here: http://sbreichenbach.tumblr.com/
Thank you all in advance! I really appreciate the help.