I agree! I think that it would have been more effective to show an individual; i.e. Booth, lurking in the background - at the 2nd inauguration; etc. Just a quick glimpse -- it would have been effective. But as Spielberg said, "It's been done"; referring to Redford's The Conspirator. I was told that he really did NOT want to get into the assassination. I also think it would have been effective to show Lincoln's last visit to Seward after the carriage accident.... then quick cut to a close up of Seward, weeping, noticing the flag flying half mast out of his window - face bandaged from Powell's attack. Then a fade to the end -
"The Past is a foreign country...they do things differently there" - L. P. Hartley