I noticed that in part where you first meet the Ichthyosaur and receive the cross bow, the scientist in the control room is supposed to have a dialogue scene, however it is not playing on my game.
this is the only dialogue bug I have found in the whole game. (Even the 2 scientists and Barney trapped in a pipe room during the teleportation labs area had funny and different dialogue)
I believe the scientist is supposed to say something like,
“Did you see it? They said it was hauled from the ‘Challenger Deep’. I swear that thing never swam in Terrestrial Waters til a week ago.”