When Grover speaks to the husband (Mark Dupont), he tells him that they originally believed his wife (Christine Dupont) was murdered to prevent her from operating on a convict (Paul Delano.) and that they'd since found out that's not the case. It's not until the scene later where another motive is revealed.
When the character Mark Dupont is talking with Grover on the lanai, his hands change from being in his lap, to fingers laced, to at his sides, and back, between shots.
The Five O team are discussing the fact that they cannot locate the doctor's cell phone at the crime scene. They think the killer took it. Yet when she was killed, the killer turned around and walked away, not going to the car to get her phone.
When Grover enters the booby-trapped house the stakes can be seen wobbling, revealing they are actually made of rubber.