Regulus in HBP????

[Carol]

Supposedly, the role of Regulus Black has been cast for HBP (see this
link for a photo of the young actor, Tom Moorcroft):

http://www.spotlight.com/interactive/cv/1812-5611-6439

He looks perfect for the part (though he could equally well have been
cast for young Severus Snape), but HBP? Are they trying to give the
plot away or just provide a bit of foreshadowing so that viewers who
haven't read the books can guess the identity of RAB? (IIRC, he wasn't
mentioned in the tapestry scene in the OoP film, which I suppose I
should watch again because I haven't memorized it yet!).

According to Leaky, which provides a link to the Moorcroft article,
they've also cast an actor named Charlie Bennison as Sanguini, the
Vampire who shows up at Slughorn's Christmas party:

http://www.the-leaky-cauldron.org/2008/4/4/report-two-more-characters-cast-for-half-blood-prince

and an earlier article mentioned Alan Rickman as Snape showing up for
the filming of that scene (sorry; can't find the article to link to
it), so we can hope that the party scene is pretty much by the book,
eavesdropping and all. (Maybe they'll change Luna's line about Rufus
Scrimgeour being a Vampire to refer to Fudge since it doesn't appear
that Scrimgeour will be in the films?)

Carol, wondering how they'll work in footage of Regulus in HBP with
Sirius dead and without giving away the identity of RAB (or is HBP an
error for DH?)