The scenes in Antwerp and outside the big house were filmed in winter as was looking out of the bedroom at the helicopter landing but the scenes looking out from the big hall show the trees as having leaves.
At 1.27, as the police officers arrive at Richie's house, they pass an officer taking notes yet she doesn't have a writing implement in her hand.
When Seraphina checks into the Botanic Sanctuary she meets a hotel clerk (Alphonse) who has an obvious French accent, while possible, in Antwerp the main language is Dutch. In a later episode Harry (Tom Hardy) speaks French as well.