I just thought of another.  In every John Landis film the term "See You
Next Wednesday" comes up, either as dialogue or back drop.  In the Blues
Brothers it's on a bill board Jake and Elwood pass as they speed by, in
American Werewolf it's the title on a theatre marquee, etc. It's in every
one of them (although I couldn't bring myself to see B Cop III, so I
don't know if he kept the streak going).  I believe it refers to Landis's
first student film (but about this I could be completely wrong).  Landis
is really into his in-jokes (Into the Night is essentially one huge
in-joke), so the term might refer to something else.  Anyway...
Lee Elliott