Entertainment Trivia Question

[nittanyalum]

Originally Posted by MysticCat

Sink me! How did I miss this thread until now? I love the Scarlet Pimpernel.

They seek him here, they seek him there,
Those Frenchies seek him everywhere.
Is he in heaven or is he in hell?
That demned elusive Pimpernel!

That's ok, MysticCat, we'll share my prize money to train for the Amazing Race...

[MysticCat]

Originally Posted by nittanyalum

That's ok, MysticCat, we'll share my prize money to train for the Amazing Race...

Now that's a plan!

[dekeguy]

There are a number of these cross-over type moments in movies ranging from recent to really early films. I gather that writers and directors like to put in these "cameo" appearances or references just to see if anybody notices. They can be blatant as in George Lazenby as 007 in an aside to the camera where he comments, "that never seemed to happen to the other fellow". Then again they can be just a fleeting comment as in Master and Commander.
Anybody want to step up and stump the trivia fans? Please post your favorite subtle story reference.