Raphael goes to see Yoshi and gives him a yo-yo. Raphael promises Yoshi that tomorrow afternoon he'll teach him some tricks on his yo-yo. But by tomorrow afternoon Raphael, his brothers & April should be long gone back home as they only have 2 1/2 days through the space time continuum to do what they need to do before going back home to the present. So Raphael made a promise that he wasn't going to be able to keep to Yoshi.
When a couple of the Daimyo's soldiers call out the Turtles, Donatello, in a moment of panic, replies "Ohayo wasabi." Ralph points out that this phrase is nonsense, and Donatello claims his Japanese is "a little rusty." However, this scene takes place in the evening. The correct term should be "Konbanwa." (Good evening.) Donatello accidentally butchered "Ohayo gozaimasu." (Good morning.) Looks like he's more rusty than he thought.
The women's kimonos including Mitsu's are closed the wrong way (right over left which is only done for the corpses for their funerals and the proper way for kimonos to be closed for the living men and women is the left over right panel).