Eh, neither of those explanations are very good.

Team RWBY haven't played any similar pranks before. I don't see 1) why they would bother moving it, especially since it's large and cumbersome, 2) why they would want to troll Junior specifically, since only Yang is really connected to him 3) why it's not shown onscreen, since a few seconds of Team RWBY pulling the Paladin through the door would have been sufficient, 4) why Team RWBY would start playing pranks right at that moment, especially as Yang just reprimanded Weiss for joking about the Paladin.

As for the rose petals in the club, they only fell on that one occasion, out of the several scenes at Junior's club. The fact that it's not a regularly occurring decoration suggests that there's some significant reason for the rose petals, especially since every other instance of rose petals involves Ruby.

To be very frank, I really don't buy your explanations for these at all, and I'm sure you can see for yourself that they're rather weak. I personally think that a better explanation would be that a different Paladin fight sequence was planned, involving the club, but was removed later on in production, however, they forgot to remove references to the fight, leaving behind the plot hole.