When Arnold is at Nedry's computer trying to access the computer's security grid...what he says as he types is pretty far off from what he types...this is what it does...
Computer reads at the top:
"Jurassic Park, System Security"
"Version 4.0.5, Alpha E"
"Ready...." (Not really important, just to show that he hasn't already started trying, this is his first attempt)
Arnold says "Access main program"
Hey types "Access security"
Says "Access main security"
Types "Access security grid"
Says "Access main program grid"
Types "Access main security grid"
It doesn't make sense why he would be saying something completely different from what he's typing...that would just make it harder.