Continuity mistake: After being violated in bizarre fashion, Janet slumps to the floor. Her dead body rests on the floor in a different position (arm on chest) just after. (01:05:10)
Continuity mistake: Don whacks the alien crab on the roulette; the cards on the table are different between shots (there is a cluster of three cards that is on the left, then on the right of the dead beast, for instance). (01:03:50)
Continuity mistake: When Don probes the first planter with the golf club, the position of the various plants changes between shots. (01:03:40)
Continuity mistake: The barf puddle on the green changes in between shots, and Pat has her mouth open when Don pulls the alien out of her mouth, but closed in the shot that follows. (01:03:00)
Revealing mistake: After the crew decided (rather arbitrarily) to use fire to scare the monsters off, the camera zooms on Jack. The zoom through the plane window is a digital effect with the plane being all CGI, and it shows because the perspective is all wrong. Jack would have never been visible from the window at that distance and at that angle. (00:55:55)
Revealing mistake: When the co-pilot searches for the missing tentacle wielding a hatchet, the creature creeps under the carpet. The distortion from the CGI effect on the rug is easily noticeable. (00:49:40)
Continuity mistake: Carol reports to Mike Don's message about the strange creatures eating up the plane's electrical system. Mike removes his visor at the cut, and suddenly on his chair you can spot the fingers of the woman next to him, who had her hand in a different spot before. (00:42:45)
Continuity mistake: Mike and the rich couple sit down to play some Virtual Chess. The brunette puts her hand on the guy's shoulder, but at the cut it's on the armchair's back. (00:41:25)
Plot hole: Everyone is by Jack to try to help with the alien monster up his nose. By "everyone" we include the pilot and the copilot. Throughout the rest of the movie they wander about plenty times, both at the same time. The automatic pilot was knocked offline by the storm, and as Bob mentions in a later conversation, it was never fixed. So, who is driving the plane? Rhetorical question.
Revealing mistake: Jack is lying on the couch (whoever managed to fetch him back from the nest is anyone's guess) with an alien tentacle up his nose. The special effect used to display the invading organism swelling his brains is an obvious image morph that does not look in any way plausible visually alone - let's not even consider the glaring anatomical issues. (00:39:55)
Continuity mistake: Jack tries to brainstorm a solution with Bob for jammed landing gear problem. Bob is useless though, and just start sobbing. In his close-up you can see the monitor on the console is switched off, while it's on in the wide shots of the room. (00:36:25)
Revealing mistake: During the "green storm", the co-pilot finally gets to her station. Cut to the playroom, and one hilarious CGI bottle of booze spins around in the air being blatantly superimposed. (00:14:30)
Continuity mistake: Carol asks her boss if he wants a card, and he says no. In close-up, he has a finger up his cheek, and it was not so in the previous wider angle. (00:31:40)
Continuity mistake: Jack the tech guy picks the fried board up from the radio station. Between the close-up and the second shot of the scene, the shadow from the keyboard changes significantly. (00:32:25)
Continuity mistake: Pilots and flight control are talking about the weather forecast. There's a close-up of the control tower monitor. Next shot is a wider one, and the computer has a different layout of open windows. (00:30:55)
Continuity mistake: Janet pulls down the bandage and watches (close-up) something move under her skin. She rightfully freaks out, but the bandage in that shot is rolled down in a different way, less folded on itself. (00:27:35)
Continuity mistake: Carol knees Bob in the nuts; Janet just her scarf off, but when she laughs at him it is back on, even if loose. (00:26:40)
Revealing mistake: Twice when both the couples of patrons are shown in their cabin and the camera pans from one to the other, right to left. Both times it's a fake panning shot with the wrong perspective in the CGI rooms, and in the second actual cabin you can even see the green screen. The first time around you can even see a door closed in one room and open in the adjacent one. (00:25:00 - 00:28:50)
Continuity mistake: Janet escorts the rich clients passing in front of the bar. When she comes back from the whole 2 meters walk, there's a towel on the counter that was not there before - and the other two staff members are still in the opposite side of the room. (00:23:10)
Continuity mistake: The stewardess slips on a little streak of alien goo and falls on it knee-first (which already is pretty difficult to do). Her knee is stained by it in a different pattern between shots. (00:21:35)
