Let's Scare Jessica To Death (1971, John D. Hancock)
Some friends retire to the countryside to strip a family asset. They find the property occupied ahem. This being the seventees maaaan, they all hang out and t'ing.
One of them seems to have some ... problems. They annoy the locals, leaving them slightly isolated.
Prime regional US horror then. The burbling, squeaking ST, the grain is apparent in the outdoor scenes etc etc.
You even get a song. Awww.
All presented in that slightly off kilter way that makes you hope and pray that they don't pull the "only a dream" bit at the end
Ahem.