Oh My Gosh! (Spoilers)
Okay, so this may not be the least believable aspect, but I've seen a few comments/reviews praising this film's dialogue. But to me, it was awful.
A case in point would be when the team happens upon the train crash. We don't see the carnage just yet - we see Gary's face as he reacts to the terrible, off-screen sight. We see his look of disbelief at the horror of it all, and he utters the line "Oh .. my .. gosh!"
"Gosh"? Really? I know they're avoiding strong language because it's just a TV movie and they need the PG rating, but that line made me think he'd seen just an uprooted tree or something. The character's a young, headstrong guy with a great mind but no respect for authority, and he's given lines like this that would be more at home coming from someone's grandmother.
I'm aware I've just gone on for about 200 words over a line that only contains three, and I accept it's a very small point, but to me it serves as a perfect microcosm for the whole film: dialogue that's entirely out of place given the character and situation. It jolts you back into the real world and reminds you that you're just watching a bunch of people pretending, rather than a group of heroes fighting to survive against the odds.
That, and the plane being frozen by a drop in temperature and shattering. That was hilarious.
Of course, the joke's on me because for all my criticism I still sat through the whole bloody film!