Here's a cool clip comparing the 2 exact scenes from the original to now:
https://www.youtube.com/watch?v=j42h5IWXz3k
Being on the critical side, they botched the muscles at .21 when the young Arnie turns around - right under the left rear delt should be the teres major, but LOOKS like they implanted a thick set of serratus anterior there haha. Also at .41, where the young Arnie is running at the old Arnie, when he comes onto the screen when you can see them both, the young Arnie looks WAAAY to short and blocky - hell he look's 5'8. Yeah I know he's barefoot and running - I get that - but still they should have made him taller. Just being picky haha. Still can't wait to see it!