1. Missing information.
2. Conflicting ways of obtaining information.
3. Receiving the same information but interpreting it differently.
Characters can be intentionally or unintentionally misled. How they feel about going forward with faulty information can result in guilt, recrimination, or resentment. It can result in a failure to meet their overall story or scene goals. This results in a need to gather new information or take action to fix the problem it has created. This moves the plot forward.
7. Inability to deliver an important piece of information.
10. Who he chooses to tell.
11. How and when he chooses to tell.
Read more about persuasion techniques and pitfalls:
The Persuasion Plot Hole
Persuasion Tactics Part 1
Persuasion Tactics Part 2
Persuasion Tactics Part 3
For more information on crafting characters and plots check out my website and pick up a copy of Story Building Blocks II: Crafting Believable Conflict in print and e-book.