The newscaster says that Dr. Judd died on impact at the scene of the accident, but he actually delivers some last words before succumbing.
When the newscaster mentions that Aura is missing, there is no photo of her in the newscast. However, when David calls her by her name, Aura asks how he knew her name. He replies that he 'saw it on the news'.
The butterfly changes between a Two-Tailed Swallowtail (yellow) to what appears to be a Monarch butterfly (orange).
Severed heads cannot talk. One needs lungs in order to talk.
When the automobile that David drives has its driver side window broken, it breaks like normal glass, leaving very jagged edges. All automobiles manufactured since 1937 have auto safety glass, which does not leave jagged edges like regular glass.
When the boy is chasing butterflies, he opens his guidebook to a photo of a two-tailed swallowtail, which plainly states it's scientific name is Papilio multicaudata...he calls it an Antheraea polyphemus, which is a very distinctive moth that looks nothing like a two-tailed swallowtail.
When the woman says she's checked into the Hopkins House "next to the airport", the Hopkins House is/was nowhere near the airport.
The lizard/gecko is obviously a fake toy when the boy has it in his hand.