Continuity mistake: When Natalie is talking to Kevin just after he has arrived at the house, Kevin says "I'm the adorable one." In the rear shots, Kevin's dad has his hand on Kevin's left shoulder, whereas in the front shots there is no hand on Kevin's shoulder.
Other mistake: When Marv and Vera first break in the house, they enter the bathroom through Kevin's room, the door wide open. Kevin turns on the shower and floods the house. Kevin's room would've been flooded as the door was open.
Visible crew/equipment: When Kevin cleans the house which is flooded from the bathroom, you can see a crew member reflected on the wall by the door.
Visible crew/equipment: When Kevin is knocking on the door for Prescott you can see a crew member reflected on the door.
Answer: Molly is wearing all gray suits and gray shoes.