The way they brought Luffy to Udon, that's the type of in canon episode filler thats good and they need to do more of. It makes sense, it's done at a time where it doesn't mess up a build up of canon reveals and it's not a staring contest/expression shot. If only they did more of that type of filler to fill in the time and less of messing up fights and big reveals with panning shots, batman fights and clash struggles this could have been a good anime.