It was very ironic when Cavager got killed by the pleiosaur. This is because he was trying to hunt and kill that exact same pleiosaur just moments before.
Whenever Loch has a flashback, he flashes back to the side of a lake with sheep by it. He remembers this because the sheep were getting pulled in and eaten by a pleiosaur.
When Dr.Sam (Loch's father) was on Cavager's yacht, he wondered if he should tell Cavager about the baby pleiosaur that his children found. He did this because on one hand, His boss might get fed up with him and fire him if he didn't tell him, while on the other hand, his children might hate him if he did tell Cavager about it.