There's an arrow chalked on the windowsill right where Autolycus' hook latches on seconds later. Some viewer mistook this as marking the spot where the hook needed to land. The arrow was actually drawn by Meg to point Autolycus to the "Special Key." The next couple of shots confirm this by showing him following additional chalk marks. The hook landing almost exactly on the arrow is merely a coincidence.
When the baby (key) in being taken by the horse and cart there is a vehicle track from an
ATV or a 4 drive visible