Other mistake: When Buck tells about his fight with Rudy, he swings while saying "Back, forth" in front of the others. They are looking the wrong way. He is also swinging on nothing at all.
Other mistake: As Sid gets Scrat stuck on his foot in the beginning of the movie, the sky and mountains shouldn't be visible, Scrat being at the bottom of the ravine he just fell in. (00:03:15)
Answer: The "green stuff" covering the view of the camera are fragments of the broccoli that were released due to the broccoli being used for hitting, likely representing the dinosaur's transition development of becoming a vegetable. The dinosaur was claimed to have become a vegetable, not that broccoli itself. The broccoli was only used, by Sid, as self-defence, turning the dinosaur into another vegetable.
Rassdyt