While it had some odd things, I think in terms of context of the times, whatever weird stuff was there didn't set it apart from the rest of the comics of the time especially DC. They had a villain with a talking gorilla henchman, the Flash had a whole society of talking gorillas. They had the A-V-M Man, but elsewhere we had Ultra the multi-alien, Metamorpho (with a caveman in his supporting cast), and the ultimate strangeness of bi-lateral divided characters - the Composite-Superman. If you want strangeness, there's the Tomahawk series at this time where he faced villains and threats more comfortable in a book like Challengers of the Unknown than the one taking place during the American Revolution. The strange things are more a product of the time and the company's general atmosphere than a product of the book. It's misleading for Morrison to single out the DP for weirdness as if that was what made the book unique and great as that was a quality most SA books had. Context is everything.
What really set it apart from the other Silver-age DC superhero comics at the time was instead the relative realism and the Marvel aspects: a team that bickered, heroes that didn't want their powers, a superhero romance and marriage (one of the first) and an adopted son, heroes that could sometimes be motivated by personal interests over basic heroic nature, uniforms instead of costumes (reflecting the non-powered teams of DC's past).
