I think the biggest thing is that Smallville they know is already taken as it's own little uni and so they don't have to pay attention to very many continuity issues but Birds of Prey works on a continuity that was already set for that sort of timeline instead of being WB's own version of the story in each and every aspect.
"But I, being poor, have only my dreams. I have spread my dreams under your feet; tread softly, because you tread on my dreams." - William Butler Yeats
"You can't find the world's perspective in reflection, but you can find yourself."
"We came, we saw, we conquered, we... woke up!"