Fillers? While some plot elements have been re-arranged or changed (In the manga they have motorbikes not airbikes) this episode pertains to the actual manga story. Most of the episodes of course contain some filler content which has been the case from the beginning of Hitman Reborn. The way they have done it though is smart and helps to make it so they don't have to have large amounts of full filler episodes or seasons like some anime *cough* Bleach *cough* does. I'm glad that it has been a small amount and even the Arcobaleno trials are considered canon so really you're only looking at a few full episodes of filler through out the series. You shouldn't really complain in that sense unless you just don't like the story.
Just figured I would give a heads up so people don't get confused by other comments.