Jet Fox

This looks like real handheld footage of a grassy hillside with a CG sphere and a fake shadow composited on top. I went through it frame by frame (see image) and here's what I found. 1. The shadow disappears too early. While the orb is sitting still, its shadow is consistently about 220 pixels to the right of it and 250 pixels below. In frame 3 the orb is still on screen at the left edge, so its shadow should be right where the red circle is, well inside the picture. There's nothing there, not even a motion-blurred smudge, even though the shadow does show up as a smudge in the frame before. It looks like the shadow layer just got switched off when the animation ended, before the orb actually left the frame. 2. The blur is a software effect, not a camera. Real motion blur is a fairly even smear along the whole path, soft at both ends, because the sensor records the object the whole time the shutter is open. This orb has a solid bright front with a tail that fades away, which is the look of a trail/echo effect in something like After Effects. Frame 4 gives it away: there's a ghost streak in the middle of the picture with no orb in front of it. A camera only records where the object was during that frame, and by then the orb was already off the left side. A leftover trail is an effect hanging around, not light hitting a sensor. 3. The shading is too perfect. It's one flat lavender color with smooth shading and a crisp line where the lit side turns dark, which is exactly what a basic 3D sphere with a single light looks like. A real object on a sunny hillside would pick up green from the grass on its underside and some blue from the sky. This one reflects nothing around it. 4. The shadow looks pasted on. Up close it's a nearly solid dark oval sitting on top of the grass. A real shadow on grass gets broken up by sunlit blades poking through it, and you barely see any of that here. Let’s remember the golden rule: physics never breaks. Ever.