No, at least not as far as the site works as it was designed. There are two basic kinds of documents (for the sake of this discussion, I'll just say that a normal node is probably a document): Document and Superdoc.

A Document is what us normal users edit. It can have embedded HTML and links to other nodes. It has other special characteristics, but those have mostly to do with what's displayed. Home nodes are Documents (or a subclass).

A Superdoc is neater -- it can contain embedded Perl code. Best Nodes, Worst Nodes, and Saints in Our Book are all Superdocs. Only gods have access to edit those.

Nodes are dealt with by type, so if the system works as it's supposed to, nothing in a Document will be interpreted as a Superdoc. :)