Invasion Season 1 Episode 10

Sirk's missing arm had obviously been surgically amputated. When it comes back as a full arm and he decides to do a 'home' amputation, he uses an unsterilised chainsaw and we hear his screams, whilst Tom Underlay is outside. That kind of self mutilation would lead to an incredible amount of blood loss- it's even doubtful he could have sustained the chainsaw hacking through the arm without passing out. No doctor was in the immediate vicinity. He should have bled out and died within a few minutes.

The light-beings attack people by attaching tentacles to their abdomen, neck, and temple.

Lewis' arm is intact after his contact with the light-being. This implies that the creatures do not create copies based on a person's features, but on DNA or some other inherent method.

Nitpick: The person that abducts Dave puts a band around his arm to find a vein, then obviously jabs the needle in his arm without looking for the vein.

The book that Dave had been reading in bed the night he was abducted is "UFO Abductions in Gulf Breeze" by Ed and Frances Walters. The book purports to tell the first-hand account of a Gulf Breeze, Fla., UFO abductee's experiences.

We learn in this episode that the alien lights were seen in Brazil, Cuba and Argentina. Everyone who had seen the lights or had shown up naked after the hurricanes all killed themselves and others.