Here are a couple of rules from last game.
JJ typing, Deploying Infiltrators and Redeploying Scouts 40k6 pg 121
When both players have deployed their main force, then they deploy their Infiltrators (as described on page 38). Finally, they can redeploy units with the Scouts special rule (see page 41).
Context: Opponent said that we have to roll off to see who deploys first, Vindicare or Fleshhounds. Never encountered this rule before. Not surprising since I've only started using Infiltrators. He questioned that. Looked it up and corrected himself that you deploy Infiltrators then redeploy Scouts. Learned something new.
Deployment; Flying Monstrous Creatures 40k6 pg 49
A Flying Monstrous Creature that is deployed at the start of the game starts in Glide mode.
Context: Opponent said Bloodthirster was flying at the beginning of the game. Asked him if it has to be in reserves in order to start the game in flying mode. Doubled checked book and yep, gliding.