though, this brings up another question: why? Everybody knows they're the antagonists (or at least try to be), so why not make them seem threatening from the get-go? This is why making stuff more "kid-friendly" never works out: I'm pretty sure a three-year old could figure this stuff out.
Later, the Rocket-Dan hold up the shop in the town. In the English version, the duo is goofy and non-threatening from the get-go; they talk about how their guns shoot out ice and how they want dental floss to go with their bombs. The Japanese version, by contrast, has the Rocket-Dan rob the store the way the Joker would; they threaten people with guns that everyone assumes is real, get what they want, and then fire off their fake guns. Except instead of a flag coming out with the word BANG! on it, for example, they shoot out cherry blossom petals instead.
I guess the trade-off to being allowed to show the footage unedited was giving the Rocket trio goofy dialogue so that the audience knows, from the start, that nobody's actually in any danger of being hurt here.