1. they showed the Alien... (i had a much different idea on what it would look like as im sure many did, and by them showing you what "they" thought it looked like... totally killed you view on it)
2. the really confusing and almost unsurprising ending... (i guess after 6th sense and Unbreakable though you've kinda cursed yourself... i mean those were kick ass endings!)
3. the fact i dont believe in aliens...
other than that it was a good movie... but i really expected more from Night