Episode #1.4 - S1-E4
Continuity mistake: Towards the end of the episode it is declared that the visit at the Knights' house happened just before 9:30. The light during the entire episode (the part referring to the first day, at least) is not consistent at all; when they go check the body in the prologue, the beach is sunlit like it's noon, while after the opening looks more like early morning.
Answer: There's probably no particular reason. Sets and props on long-running TV shows often change as needed and for various reasons throughout a series run.
raywest ★