With a total of 52 boo-boos, Twilight is second only to Indiana Jones and the Kingdom of the Crystal Skull in Movie Mistakes 2008 ranking.
I completely missed most of these snafus, including the following: Visible crew/equipment: Bella is sleeping and dreams about Edward for the first time, and she wakes up in shock and looks over and "thinks" she sees him. Then the camera is back on Bella, and you see the reflection of Edward walking out of the shot. (You see the light reflecting on Bella's face of Edward's shadow.)
Click here for full listing of mistakes.