Along with all of the problems listed in Interaction, dialog systems include additional problems.
Some of the entries are inherent problems, but some of them are common problems that can be potentially avoided, either through design or additional features.
For most games, dialog structure and content is not dictated by general rules. Each dialog node and its relationships to other dialog nodes are custom.
Many of the other problems with conventional dialog systems is at least indirectly derived from this.
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Solution: General dialog system.
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Players have to guess what the consequences of their dialog choices will be.
A similar unknown exists in real life, except a large portion of everyday dialog is exists to reduce the unknowns.
People make make a choice out-the-blue, but often dialog is a back and forth process of clarification.
That is a process both participants have control over.
In most games with branching dialog, players have none of these real world tools.
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Solution: Clearly list state changes for each option
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The reverse case of Illusory effects.
Sometimes dialog choices effect game state and the player is never aware that anything changed.
This would be less of a problem except so much of dialog content is noise.