Hey Roland,
In the scene where the Delorean bursts out of the barn, Mr Peabody throws his son out of the way. If you go through frame by frame, the comic book opens a little and you can see a little bit of a page.
It's not enough to identify it, but maybe if someone does figure out which book it is, this extra bit may be able to confirm whether different comics were used.
(I havent taken a screen shot because your Blu-Ray will be much clearer than my DVD)
Nice find. Unfortunately you can't read anything even on a Blu-ray shot. But it seems to be a page, where you can order a subscription. The white box on the bottom of the page looks like an address field / order form for cutting out.