Tossing in my two cents about Mort and Jack my only comment (since I was a big Julie fan ) was that I never much cared for imaginary stories.  Actually I hated them.  Even today I get a chuckle whenever I seen the old ad from back then, "The imaginary story that you thought we'd never print!", kinda like an oxymoron since such a tale had no actual effect on continuity back then (or even now) so who cared.