The Luffy looking for Ace scene was indeed very well done. The darker tones to distinguish Luffy from his surroundings + the music + the general direction of the scene are all examples of how short, middle-of-the-ep, filler (kind of) scenes should be done.
And in regards to Luffy's mouthing of "Eeeeeyyy-ssuuuu," it won't be that hard to adapt. Just extend the "ey" part and seriously shorten the "ssu" so that you only see the "ss." Or just cut away to a still right before he says it.
And jokes aside, what is the other guy doing carrying that "bag" thing?
Whoa.
Look at the pattern on the bag. O_O