When Mr. Archer is packing his wife's suitcase to send her to the insane asylum, you see that he closes it with a lot of her clothes hanging out the sides. As he walks down the stairs, all of the clothes that were hanging out are tucked neatly into the suitcase.
When Mrs. Archer's butler and the sheriff are checking out the alien ship, all the equipment on-board appears to be made for a normal sized human, when it is quite clear that the ship is being piloted by a giant.
In the first scene, a newscaster describes sightings of a strange object over the Barents Sea; Cairo, Egypt; Capetown, South Africa; and Auckland, New Zealand. He then walks over to a globe to show the flight pattern and points out the locations on it: Barents Sea, Cairo, Auckland (clearly pointing to South Africa), and then New Zealand.