Withdraw, dismissing spells, and sneak attack damage

There are a few rules I would like to clarify. They did not slow down the game after play, which is awesome. Sometimes rules arguments can ruin games, and I am glad everyone has a "play first, look up rules later" attitude.

Withdraw is a full-round action which allows a character to leave its first square without drawing attacks of opportunity. He may move up to to twice his speed, and if he leaves a threatened square beyond the first he draws an attack of opportunity.

Entangle and grease are both spells that can be dismissed. In the duration field of the spell's description, the symbol "(D)" means that the caster can dismiss the spell as a standard action.

From Skip Williams:
"When you make a sneak attack against a foe with damage reduction [like the grick], roll the sneak damage and add it to the damage from the hit before applying the effects of damage reduction."

We will be playing on Tuesday, December 4th at King's Hobby.
8810 North Lamar Boulevard, Austin, TX