During my gameplay so far in Act 1, I've noticed several occasions when dialog options requiring dice rolls use an incorrect ability for their check. For example, during a conversation with Gale that starts when he is looking at an image of Mystra, one of the options requires Insight; however, the actual check is then made against Intelligence even though Insight is supposed to be a Wisdom skill.
The other occasion when something similar happens involves dialogs with a Detect Thought option. In that case, the tooltip indicates that ability bonus would come from Wisdom, but the actual dice roll again uses Intelligence for its bonus (or penalty).