Altered Scene: Gevanni's Role
Before SPK Agent Gevanni reports to Near about seeing Mikami talk to himself, the manga has Near and Commander Rester bounce ideas off each other about Mikami's shinigami. Near ponders over why Mikami and Light would not use Mikami's own shinigami as a way to contact each other, instead of Takada, while Rester suggests that the shinigami may simply not be as cooperative as the one directly working with Kira. What the two did not even consider until Gevanni's report was the possibility of Mikami not having a shinigami at all.
Later, the manga has Near make further plans to have Gevanni actually touch Mikami's notebook to confirm that there indeed is no shinigami connected with Mikami's death note.