Nodes are created on node preview

yes, i see this as well... not sure what solution would be since std preview mode shows a noderef field as a link to that field.

i guess you would expect to see the text of what was entered as just text; not a link.

Is it possible to add a check before creating a new referenced node if a node with the same title already exists?
It would be a nice solution to duplicating referenced nodes with preview button and submit button pressed twice.

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This is an important issue. Since the module does its work in noderefcreate_autocomplete_validate, new nodes can be created in all kinds of situations that might not yield a calling node.

For example, if you expose a content creation form to anonymous users, and that content's node type contains a nodereference field controlled by this module, Mollom may block requests to create new calling nodes, but the linked node(s) are generated anyway. This can fill your database with thousands of nodes whose content exists solely of offensive or otherwise spammy node titles.

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I love this module, and the concept. Unfortunately, I am also using the Inline Registration Module which causes an issue with this module. Inline Registration allows an anonymous user to create a node (and register at the same time). An anonymous user can try to create a node with references, but if the registration fails, the references are still created - due to the early creation of the references.