When the survivors of Flight 29 first wake up and start figuring out their situation, Jenkins tells Albert that everyone on the plane, including the people who disappeared, must have been asleep when the event happened - because if anyone was awake during the event (whatever it was) they would have screamed and awakened the others. But later, when they are about to go back through the time rip at the end of the movie, he shouts that everyone on the plane who was awake the first time they went through disappeared. We cannot dismiss this as Jenkins just contradicting himself or changing his mind - first, because there is no indication that he changed his mind or believed his initial analysis was mistaken, and second, because his initial analysis is just stupid. How could anyone think, even momentarily, that every single person on a plane, including the crew, could have fallen asleep at the same time? And if everyone on the plane had been asleep, why would only some of them have disappeared and some survived? [Between them first waking up and going back through the time rip, he's obviously figured out a lot more than his original theory included. His initial analysis being stupid is a character flaw - although an understandable one considering what had happened.]

In the scene where the plane is at Bangor Airport and the survivors have already worked out that no match will burn because the air is different. Dean Stockwell and the teenage girl are standing at the bottom of a stairwell by the plane and the girl lights up a cigarette. How? [This is explained later in the film. He realizes that anything from the plane, or brought onto the plane with them functions properly. It burned because she had it on the plane.]

When the crew of the plane enter the airport terminal after landing the first time, one of the passengers goes up to a lobster tank, and there are still lobsters in it. I thought all living things had disappeared. [They're stickers - part of an advert].