The lighthouse was accessed by boat and all of the equipment had to be carried up a ladder.
The keeper's house was actually located on a city street, not an island.
"Stalker's Prey 3" is the second feature film to go into production in Connecticut during the 2020 COVID-19 Pandemic produced by Synthetic Cinema International. The first being Hallmark's "One Royal Holiday" also produced by Synthetic Cinema.
The story of Ernie is inspired by the ghost that is said to haunt the New London Ledge lighthouse, the location that inspired this film, but was too impractical to shoot on.
The lighthouse light is actually quite dim in real life and was augmented for filming both with film lights and CGI.