Continuity mistake: When the boy wakes up in the middle of the night after first hearing the dinosaur, his alarm clock reads 2:0x (its not clear but the digit segments on show imply it's either 2:05 or 2:06). The next time we see the clock it's 2:02, then two scenes later when the dinosaur decides to and then does jumps off the table the clock now reads 2:22.
Visible crew/equipment: When the police woman falls off the boat when the shark hits it, on the right side of the screen, you can see a hand outstretched, as if reaching out to grab her. It doesn't belong to the only other person on the boat, since he's behind the wheel and completely out of reach. So, it belonged to a person who wasn't supposed to be there.