Bugliosi did what's called research.
More like Bugliosi’s verbose way of showing that Oswald may or may not have preferred Dr Pepper at lunch time, which proves exactly nothing about nothing.
Nothing there about Oswald's preference of soft drink. Of course, claiming he already had purchased the drink before the encounter instead of after meant he was--pardon the pun--grasping at straws for any alibi, no matter how shaky.
Baker’s statement said “drinking a Coke” until that part was helpfully crossed out.
Furthermore "OSWALD stated that he took this Coke down to the first floor and stood around and had lunch in the employees lunchroom." We know that's a lie because Oswald didn't bring a lunch that day
We don’t “know” anything of the kind.
and he was seen by Mrs. Reid moments after the lunchroom encounter passing through the second floor headed for the front door
Mrs. Reid didn’t know where he was headed.