^^ it's not required for Stevenson to be a walking Punisher dictionary.He doesn't need to 'get it right' on every single fact about the character.
I doubt that even Hugh jackman knows every single thing about Wolvie...or Bale about batman.
I've been reading the Punisher since the early 90's...and even i don't know the exact year the punisher character made his 1st appearance...i never even read that Spiderman issue.
I guess what happened was Ray probably read the max issues ONCE in preparation for the role.And he probably did a litlle bit of research...for five mnutes orso.
As long as it does helped him prepared for the role, that's good enough for me.I don't need him to be a punisher geek.