Revealing mistake: After Katie pulls the TV plug she tries to find Becca. When we see her from upstairs there's a reflection on the floor next to her that can only come from a ceiling light. However, there's no light falling on her. (00:06:30)
Revealing mistake: During her research on the video tape Rachel comes across a picture of Anna Morgan drinking champagne with some friends. It's quite obvious that her picture has been copied in. (00:41:25)
Revealing mistake: When Rachel searches online for "Moesko Island," you can see in the address bar of the browser that she is really looking at local files (C:\WIN98\Desktop\search.com\... etc). (00:42:30)
Revealing mistake: In the scene when the main character is in the library on the internet, she goes to a couple of websites. When the shot shows the URL up top, it is C:\windows98\mydocuments\etc.html. Instead of actually searching on the web they used a premade html page and accessed it from their computer.
Revealing mistake: When Rachel is racing to save Noah, she is trying to call him on her cell phone. There is a shot of two hands on the steering wheel as the car turns and then a cut to her holding the phone in one hand a split second later while she was talking the entire time, showing that the shot with both hands was a stunt double and not her.
Revealing mistake: After Rachel tumbles down the well, we see her heavy-duty Eveready Commander Flashlight, 12-volt battery and all, bobbing above the surface of the water like a cork. Which is ridiculous. A real 12-volt Commander Flashlight would sink like a rock, because it weighs about 4 pounds. However, the filmmakers needed to explain how Rachel could see at the bottom of a pitch-black well, so they used a lightweight, floating flashlight prop, supposedly providing a light source for the scene.
Answer: At the end of the movie, she is crying about why she wasn't killed and Noah was. She vocalizes "What did I do, that he didn't?" That's when she sees the copy she made. It wasn't that she just showed it to someone else. She made a copy and Aiden watched that copy. Aiden is why it skipped her.
Almost right. It's just the copy. Copying the video makes it skip you. That's why she has Aiden make a copy as well.
lionhead
You have to show the copy to someone else as well. That's why Aiden asks Rachel at the very end "What about the person we show it to? What happens to them?"
Phaneron ★
But doesn't he have less than a day left by then? Hardly a time to relax, they need to make a terrible decision, quickly. I always had the idea making a copy was enough because of that.
lionhead
He watched the tape the morning of either Rachel's 4th or 5th day, so he should have at least 3 days left by this point. Though it appears the film was being inconsistent with the markings that Samara leaves on the tape's viewers, since Rachel noticed Samara's hand print on Aiden's arm and then his nose started bleeding. For Rachel, she got her nosebleed before receiving the mark on her arm.
Phaneron ★
Actually, you need to do both: make a copy and show it to someone else. This is further explained in The Ring 2. At the beginning, the guy had made a copy but since the girl covered her eyes and didn't watch the whole thing, he was still killed by Samara. So making a copy is not enough in itself to be spared if no-one else watches it. The same goes for Rachel. She made a copy on the 2nd day, but Becca tells her she only has 4 days left when she visits the psych ward indicating she hadn't been spared yet. It's only after Aidan watches the copy she made that death skips her for good.