The boat scene at the end of two. Makes no sense, right?
>T-Rex is safely locked up in the cargo hold, and sedated
>Baby T-Rex is in Jurassic Park San Diego
>Boat is presumably deserted, and yet, they are all dead.
Who killed them? Well, you know what they say, to understand the future, you have to go back in time. Isn't it odd how the hand was bitten off and holding onto the steering wheel? And the body holding the hold controls? We've seen that before, somewhere.
Ellie Sattler, when she was going to restore power in the first one, a severed arm falls onto her, giving her a false sense of security. The raptors were always able to set traps with bodies, that wasn't something they just learned in the third one. In fact, their traps were more subtle in the beginning. The raptors actually had an understanding of human psychology, that they could manipulate Ellie, and now in the second movie, guide Malcom's attention to the bridge of the ship.
They knew humans would go for the bodies and the odd placement of limbs would unsettle them and cause them to think irrationally. They wanted that hold door open. But they couldn't do it themselves.
1) The T-Rex getting released at sea wouldn't work it would rock the boat and likely end up drowning.
2)The goal of the raptors is to evade detection. They could open doors themselves, of course, but they need a distraction to escape.
So their plan was to get all the heat away from the boat with the T-Rex and they can escape onto mainland in the meantime. And it worked. Clever plan, took me decades to decode it, but once I saw that severed arm in Jurassic Park 1, it all suddenly made sense. gg raptors but the jig is up.