In the 2008 Anne Hathaway film 'Passengers', a woman is a survivor of an airplane crash.
However, she later learns this is untrue, as she died in the crash, and the people she interacted with afterwards were actually her dead friends and family helping her to realize she died, regain her memories, and that it was time to move on to the afterlife.
This movie received incredibly negative reviews (it was indeed, a poor movie).
In the Lost finale, the FS characters are all dead, and they realize this by interacting with one another, regaining their memories, and in the end they prepare to move on to the afterlife.
The coincidences here between the plot of 'Passengers' and the Lost finale are too much to ignore.
Total rip-off of a bad film.
Update A commenter has pointed out that 'Passengers' has an eerily similar plot to a film called Jacob's Ladder. Now, add that to the equation. This cannot be a coincidence.