The first time I saw this chapter I don't understand much but after 5 or 4 years I was able to understand every reference, every joke, every detail and the plot itself.
It easily manages to be the best chapter of smg4 and not only that, but the best Mario parody of all time (taking into account robot chicken, dorkly, flash gitz, etc). Since he has excellently planned each joke or comment.
Mario's stupidity for this chapter is a key factor for the plot, impatience or short periods of time of toad on the screen make you laugh and the comments of smg4 encourage you to continue watching the episode.
It has several well-placed references and details at the right time (Like the taco shop by waluigi, the license plate itself, Mario's gps, the misspelling in "Didney Land") which makes it feel more unique.
Really beyond the great nostalgia, the chapter is memorable and very enjoyable.