Lockdown, Bitches

The Claire episode was great, then the show lost its steam with weeks and weeks off. It came back last week with a Chang-centric episode that was so uneventful, no one even came on here to discuss it. This week however, oh man.

Talking points for the below comments section and yes SPOILERS ABOUND:
1. Was that Sayid's girlfriend that Locke checked the house for?
2. What the F was that map/chart/awesome thing written in hidden ink on the back of the blast door.
3. Who thought of stormtroopers when they called them blast doors?
4. Is Henry Gale an other who killed and took the hidden identity of a black man? How did he ever think that was going to work?
5. Why did the hatch lockdown? What was said on the intercom? And why isn't Locke dead after losing so much blood having a 6 inch metal spike through his leg?
6. How is Jack that good at poker? What was he doing in Thailand? And what was Sawyer's tell that Jack knew his pair of 9's was good against Sawyer's pocket 5s? (Sam, you were right, GDGE).

Discuss.