Nothing special. Nothing offensive.
Certainly don't think he should get a default Oscar nom for it.
And yeah, I really loved that long walk down the corridor as his butler(?) watches him leave. I think the audience would have felt a bit robbed on a fade to black there, to be honest. Still would have been better than that fake-out we got instead.
Personally, I would have followed the Lincolns into the theatre and to their seats. Maybe a brief moment of tenderness between husband and wife before the curtain rises, fade out.