Shutter Island (2010) - 3 questions

Question: Is he actually sane at the end? I ask this because it looks like he makes them think he is insane so they will give him a lobotomy, and in that way he could forget about killing his kids indirectly.

Answer: I think it's meant to be ambiguous, as nothing's explicitly stated either way. My take was the same as yours, namely that he'd rather die as a good man than live as a monster, to reference the line he says, but him still being actually insane also fits.

Question: The children in Teddy's hallucinations were bloody but they died by drowning. Is this just an inference to Andrew's guilt that his children's "blood is on his hands" because he didn't seek treatment for Dolores' mental illness? Or is it Scorsese being overly dramatic and adding a lot of blood where it doesn't belong? Also, how exactly did Andrew kill Dolores? Did he use his service revolver, even though we don't hear the shot?

Answer: I think the recurring blood comes from the blood of his wife when he killed her. there was a lot of blood you see, in his psychosis that means a lot and has taken over a large part of his hallucinations, just like Dachau camp. Yes, he did shoot his wife Dolores, in the belly. You can see it in the end of the movie.

Question: One of the corrections says that a particular scene is one of several hints throughout the movie that Dicaprio's character is having delusions about the whole thing. What other scenes shows evidence of this?

Answer: In the beginning of the film when the 2 Marshalls were coming of the boat - Teddy's partner had a hard time removing his gun from his holster when asked, which isn't in keeping with an experienced Marshall.