Yeah, I'm sure I looked over dozens of points because they didn't have that characteristic shape or the flaking wasn't obvious. The flaking is more obvious in person or when they are wet. Typically you can tell if something has been worked if there are flakes in parallel moving away from the center of the point. When looking down the point or tool you can see the flaking pattern from opposing sides that wouldn't generally happen naturally. Some of the flaking may be more crude and some more intricate.
Here are some screenshots of the videos of me pulling them out. Sometimes it's just the initial shape or straight edge that catches the eyes.