Woulda been pretty easy to miss, seeing as no one remembers a thing about SMRPG except Geno. Haaaaaaaa
Interesting that they'd think to bring back the Mukumukus. What was their deal anyway. The enemy was only at Star Hill if I remember right, but apparently they were supposed to be some kind of important, because there was an item that summoned one in battle (cost 69 coins and healed 69 HP. Gross)
The only other thing that carried over from SMRPG to anything would seem to be the Shamans, retooled into Merlon's family in Paper Mario, then retooled to be... a cult whose names are actually titles... it's weird 'cause they pass it off like the name indicates your job, but Mushroom Kingdom Merlon and Rogueport Merlon don't do anything even close to the same thing, Rogueport Merluvlee does Mushroom Kingdom Merluvlee and Merlon's jobs, Rogueport has no Merlow and instead gives his job to Dazzle, and Merlee's job has been perfectly consistent for all three games, right down to her apparent need to speak in rhyme.
What's up with THAT, huh