Altered Scene: Ryuk and Sidoh
In the anime, Ryuk first confronts Sidoh while in the middle of snacking on an apple, alone in what is suggested to be Misa's empty hotel room. The manga introduces Sidoh to Ryuk slightly earlier, while the Task Force exchanges the death note for Sayu.
The following scene with the two shinigami meeting at an abandoned street corner is also significantly altered. The anime version has Ryuk completely disinterested in Sidoh's dilemma, not wanting to help him out whatsoever. In the manga, though, Ryuk is oddly cooperative, telling the pathetic shinigami any information he can. Sidoh also takes out some scrolls depicting the rules for shinigami in various situations, given to him by shinigami Armonia Justin. In the case of the shinigami attached to the notebook dying (as is what happened to shinigami Rem and the death note currently being haggled over), the shinigami (in this case Sidoh) may gain its ownership by waiting for the current human owner to die or have that human willingly give the notebook back to them.
Ryuk reassures Sidoh, telling him that if he remains with him, he will "probably be fine."