I confess that I have not had a chance to read Ivanhoe yet (my copy still has not come in the mail), so I can't compare the movie to the book, but I can compare it to what I know of Robin Hood stories and films.  I think that Ivanhoe as a film glorifies King Richard the Lionheart in the same way that most versions of Robin Hood do.  This, however, is not the case in Ridley Scott's Robin Hood, in which Robin Longstride is sick of fighting for Richard, is disgusted by the horrors he has witnessed and inflicted at Richard's command, and eventually flees Richard's service.           

I find it interesting that the two Jewish characters in Ivanhoe are named Isaac and Rebecca, like Isaac and Rebecca from the Bible.  But unlike in the Bible, where Isaac and Rebecca are husband and wife, in Ivanhoe they are father and daughter.  I think this was probably a way for the author to make it immediately obvious to his audience that they were Jewish, knowing that Rebecca and Isaac were very familiar names associated with the Jewish faith.  The only other connection I see is that both Rebecca in the film (and, I imagine, the book as well) and Rebecca in the Bible are supposed to be very beautiful.  

Switching subjects, I discovered that the British refer to what we Americans would call cotton candy as "candy floss."  I also found out that hydrogen peroxide is harder to come by in the U.K. than it is in the U.S.  The only way I could buy it in Ormskirk was to get it from the "chemist's" (translation: pharmacy).