I got bored having played Chapter one through a thousand times, so after getting to Level Two I noclipped down to the Level Zero East Wing, specifically the area where we first meet the security team after the infection starts. I assume that's the model used for Jake in the cutscene. Also, in the prologue, if you stack up some crates to get over one of the shipping crates that looks like the one you open up somewhere around here, you'll find an old friend.
Who I may or may not have beaten to death. Fun fact, that stops Frank from talking for a while,