Samara didn't record her videotape over a football game at the cabin.It's too convoluted; how did she get the power to tape over things in progress? There's a much simpler explanation which makes much more sense: Cole Sear helped her record the tape in an effort to help her pass on. Poor optimistic kid...
Samara is not a ghost; she's an alien of the same species as "The Wire" from Doctor Who.Both exist as images on TV screens; both are able to stretch out from the screen and attack people, leaving their faces deformed. Alternately, The Wire and Samara are the same entity; the Doctor forgot to tape over the video which he trapped her on, and it found its way into the cabin. Having been imprisoned on the tape for so long, the Wire has gone mad and all that's left of its mind are the disconnected and nasty images on the Curse Tape, as well as a psychotic desire to destroy humans. There being more than one Wire would also explain why the events in The Ring occurred in both Japan and the USA.
Samara DOESN'T require people to copy the tape to lift the curseSamara spared Rachel because she found her dead body, and her son because he's another child (or just to thank Rachel). Noah dies because he never entered the well and Samara didn't notice that he helped out too.
Samara's powers come from electromagnetism.Notice how all the things she levitates with her mind have some metal in them. She created a partial backup of her mind by magnetically rearranging a videotape. The people she's marked for death show up fuzzy on video cameras because her magnetic powers interfere with their electronics. It has also been established that particularly strong EM waves can effect the brain; this is how she kills, by projecting powerful EM waves at some key part of the victim's brain, causing it to fail catastrophically. Note this only applies to the American version. Sadako does a few things that can't be explained this way, such as predicting the future & communicating with smallpox.
The events of the Ring movies happened inside a computer simulation; Samara is a virusThis is actually the premise of Loop, the third novel of the Japanese Ringu series. In this novel, set in the "real" world, a computer simulation called "Loop" exists, and that is where the events of the previous two novels ("Ringu" and "Rasen") took place, and where Samara (Sadako) is nothing but a computer virus. The novel also explains that Noah (or better, his Japanese equivalent) realizes that he is living in a simulation, and uses his phone to contact the lab in the real world where the simulation is being run, asking the scientist who answers to "bring him to wherever he is". The scientists synthesize human DNA to reproduce the virtual "Noah" exactly and create the main character of the novel. Unbeknownst to them, when "Noah" made the call, he was already infected by Samara (Sadako), who changed his DNA, so they also brought her in the real world, as a real virus.
Andou is really Koji SuzukiIn Rasen, Andou makes a deal with Sadako, and writes a book about what happened, which acts as a vehicle for the virus. Obviously, this was the novel 'Ringu', and Koji is merley claiming it as fiction to cast disbelief. This also means Rie Inou is Sadako, as the book ends with Sadako auditioning for and being cast as the role of Sadako in the movie being made based on his book. THE TRUTH IS OUT THERE PEOPLE!
Samara was possessed as a baby.It's strongly implied that Evelyn (Samara's biological mother) is a psychic: she knows when people are going to come for help, could see that Samara was ... er, Samara, etc . It could be possible that Samara was one as well, making her susceptible to possession when she was too young to fight it off. Poor Samara was forced to "sleep" her entire life as an evil spirit destroyed the life she could have had.
The black haired woman that comes out of the TV in the japanese movies are actually corpses thrown in The Well. In Sadako 3D Kashiwada Seiji had apparentlly attempted to ressurect Sadako as revenge against the human populace for persecuting him by throwing long haired women into the well alive and considering how those long haired women reappear in Sadako 3D as zombies that chase after the main character like spiders and considering how those zombies have the same dead skin as the being coming out of the TV do while the real ghost of Sadako looks like a living person with long hair and short bangs it's obvious that the entities coming out of the TV are the Zombies of people thrown into the well and not Sadako's ghost.