I have to believe that Ben understood every facility used by Dharma. i doubt it took him twenty years to put the gas mission into affect, he was shown to get the fence code at a young age, and no doubt Ben likes to be prepared.
There have been comments about Danielle's accent as well. I never realised it, but the producers say it's easter european, not French. Perhaps Annie never heard a french accent, but learned french during her brainwashing, and used an accent of someon else sh knew. There has to be a reason the producers put in an accented, but not french accented, French woman. What.