In the flashback where you have to take a picture of Lisa talking to the bodyguard you can find Eko. While the blonde woman is yelling at you, look up and to the left to see a rather muscular African-American in a preacher suit standing above. This is just something cool.
Right after the people run out of the jungle scared of the "monster", talk to Kate, as you do so, the ghost person you saw at the beginning should walk behind Kate. Note: This will only work the first time, and it might not work at all.
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