Simon shoves a bad guy (wearing a red jacket) out an office window. The guy goes out backward. The next shot, from above, shows a dummy falling face-first. The next shot shows the stuntman falling backward again, obviously on a safety wire.
When Ashton has Claire tied up in his library, he goes outside to meet her father. After acquiring the disk he goes to test it. When we next see Ashton he is in a car on the way back to his house, presumably from checking the disk. But when he reached his house, he goes back inside to check the disk there. It is unclear as to why he then even left his house in the first place, if the equipment he needed was already there.
During the fight scene on the bridge with Micro and the herd of sheep, one of the bad guys is thrown over the bridge. About half way through his fall, you can see the tether he's attached to stop his fall.