Board Thread:Movie discussion/@comment-26938547-20160312014018/@comment-27825256-20160312015236

the hard answer too is that there were adjustments made to the animal for costs and for illusion sake. For example, If I recall the Rex's head was shrunk slightly but when you see it on screen, you're mostly looking at an angle NEAR the head, or at CG. And since many angles in Jurassic Park are somewhat extreme, it didn't look "wrong."