There were a lot of scenes in the opening that weren't ever in the show, and a few of those look like they weren't just made for the into. Anyone have any info on those scenes? Were they from an unaired pilot or something?
I don't know the answer to your questions but I also wondered this the boys being licked by a lion ,Scrooge flying around trying to catch money in space,and him and Webby where she kisses a shark .Know of those were in any of the shows .I wonder if they made up for the opening or screens that were cut.
I think they were made especially for the opening titles. It's just a theory, but maybe the original opening credits was nothing but original scenes/animation that'd be exclusive to the opening, but the execs didn't like it so they went through the episodes and just used clips from the actual series with bits of the original opening spliced in.