Revealing mistake: When the car Paul is driving spins out of control and flips, the roll bar is visible through the back window.
Revealing mistake: Look closely during Clive's argument with Graeme. You can see Ruth's left eye which is supposedly blind, actually appear normal behind her glasses' dark lens.
Answer: Since Paul is an alien, his race would probably give their body parts names that are in their own native language. To humans, we have throats. To Paul's race, jorph is their word for throat.
It cannot be a throat as it is an opening, it is more likely an opening that acts like a human ear.