Continuity mistake: A few times when Emily fights with the intruder, her hair changes from being in a ponytail, to down. (00:46:30)
Continuity mistake: Emily's hair scrunchie appears in her hair as she is answering the phone and seems to have fallen out during the struggle but reappears and disappears several times throughout the attack.
Continuity mistake: The shoebox with the money in it goes from no rubber band around it to having one around it, when David takes it out of the bag.
Answer: It is unknown what Douglas' entire thinking was behind the plan, but if someone had spotted David in the stairwell, it would only help to support Douglas' alibi and point the finger at a stranger breaking into the apartment and killing his wife.
raywest ★