According to the dossier scene, the IMF brings in the Phillips Maintenance Company. It is implied that the window washing maintenance man is privy to some part of the ploy, as he assists Barney in his part of the plan.
When seated on the sofa in the office near the end, Paris (Leonard Nimoy) raises his right eyebrow in a very familiar gesture.
When Stone is placed in the ambulance, there is a rather large crowd watching the filming from behind a grill fence.