Immediately after getting the gadgets:
--Armchair in Harbor Cottage
--At the gate in the cave near the fens

Inside the Beach Caves:
--Tidal Chamber
--Campfire in Smugglers' Cave

Northfield Church:
--Church pews
--List of rectors

Museum (First Visit):
--Skeleton

Night 2:
--At the end of the hallway in Harbor Cottage
--Train Station Photograph

Museum (Night Visit):
--Bathroom mirror
--Noose
--Mysterious painting

Night 3 (After Lucy joins you):
--Harbor Cottage rafters

Ulcombe Church:
--Gramophone (After Nancy leaves, after you wind it)

Beyond the old mine:
--The decorative stone just past the blast point

Night 4:
--Bathtub in Harbor Cottage