Audio problem: During the sequence where Lindsay is telling them about the tape with the lipstick on it, they show a man tying up a woman. You hear the sounds a woman would make if she was muffled by a gag (tape) on her mouth as she's being tied/struggling throughout the scene, but her mouth doesn't get taped until the end of the scene.
Continuity mistake: The first time Mac tests the cleaned up blood on the floor, it shows positive with Luminol. However in the flashback scene with Lindsay, the Luminol is not showing up.
Chosen answer: Probably to broaden the scope of the show's plot and give the audience a chance to see the characters in a different setting, People act differently at home from the way they do at their workplace. By the ninth season, the characters would have become overly familiar and predictable. It gives the writers a chance to do something different with them.
raywest ★