People need to stop trying to explain the big drop in the T-rex paddock
Look at every shot of the area. You can clearly see the ground on the other side of the fence being the same level and it's all uphill from there. Then look at shots from the actual drop. The car falls at least ten meters before it even hits the tree, so you're not seeing treetops.
They fucked up. Deal with it and move on. It's still a great movie.