Joaquin Phoenix replaced Mark Ruffalo, who had to pull out of the film due to a brain tumor. It was later found to be benign.
The artwork in the book about extraterrestrials was done by writer and director M. Night Shyamalan's daughter, Saleka Shyamalan.
The production used a new watering technique to make the corn grow faster, which the Delaware Valley agricultural college was then very keen to adopt for themselves.
Mel Gibson didn't realize M. Night Shyamalan was playing the vet until the day that they came to shoot their scenes together.