I watched the video of James Foley being beheaded...Edit with second link
It was very odd.
1. Stilted dialogue aside, the knife is much too small to behead anyone but a chicken.
2. When the bad guy grabs James head and starts sawing away, even after 7 saws there is no blood whatsoever.
3. The camera cuts away before the "actual beheading"
4. When it shows his body afterwards, there is only a small amount of blood on the ground and his neck has a very clean guillotined appearance.
The head at the end looks very real although it's a still shot instead of film. It's possible the photo was edited to look the way it did or at the very least if he was executed, it wasn't at the spot at that time.
The whole video comes off as very fishy.