When Eric saves Grant from a group of Velociraptors.
The Spinosaurus in general is full of it, shrugging off being hit by a plane and most memorably crushing the T. rex in single combat.
The fight between the two apex predators deserves a side note. No matter how divisive it proved to be, the brawl between the Spinosaurus and the Tyrannosaurus was the first time in the franchise we got to see a full blown, drag-out fight to the death by two giant dinosaurs. And it still looks awesome!
The fact that Eric, a 12-year-old boy, spent eight weeks completely alone on an island full of dinosaurs, and not only managed to survive but actually seems to be doing quite well by the end of it. He doesn't seem to be starving or sick, and has apparently figured out both how to stay more or less out of the way of the dinosaurs and how to fend them off when he does run into them. Compare this to the adults, who don't even manage a day on the island without drawing the attention of a Spinosaurus, a T. rex and a whole bunch of Velociraptors.
She might have caused much of the problems in the movie, but you got to give Amanda some credit when it comes to the climax. Not a whole lot of people would have been so collected upon being cornered by angry Velociraptors that had already attempted to kill them.
The moment he realises that Paul lied to him about the true nature of the visit, Alan punches him (offscreen) and prepares to wind up another if he doesn't start explaining. Alan, much like Ian in The Lost World: Jurassic Park, is smart and badass enough to know that the sooner the actual problems are up in the air, the sooner they can be resolved and everybody can get away from Site B before more lives are lost.
In terms of special effects, the animatronic Spinosaurus was a gigantic undertaking and feat by Stan Winston and his studio staff. The full robot weighed over 25,000 pounds and was made from the ground up as the largest and strongest animatronic the studio ever made. The result was a machine who was fully articulate, far stronger than the old T.rex machines, and able to perform acts in the film like fighting similarly sized Tyrannosaurus animatronic, tearing apart an airplane, and sinking boat even when immersed in water and getting rained on!