Deliberate mistake: When the ship crashes into the dock, all of the scenes leading up to the crash and after it show a clear view across the harbor as we can see lights and land on the other side. It's not until the ship is about to crash that a thick and dense fog appears and disappears within a minute to mask the ship to create a more dramatic effect.
Deliberate mistake: When Sarah, Ian and Nick are climbing up the cliff with the rope, Sarah is able to easily pull the rope up to place her hand underneath it for a better grip. The rope is quite lax for having three full-grown adults hanging from it.
Answer: The dinosaurs on Isla Nublar are not mentioned. In the first book they are destroyed by bombing, which makes the second island more surprising - a lost world.