It was so refreshing to see "Mom and Dad Have a Great Big Fight / D.W.'s Perfect Wish" today, this is one of my favorite episodes as a whole, both entries are among the more realistic situations that little kids would face; I like how in the former, neither Arthur or D.W. can understand what their parents are arguing about (just hearing blah-blahs), but each of their imaginations over-reacting as to what could possibly happen now that their parents seemingly hate each other. As for the latter, I think just about all little kids, at one age or another, go through what D.W. went through, as to worry about what the next big step in growing up will be like, even though I think Emily overly dramatized it a little too much for D.W. anyway.
It's just too bad that D.W. couldn't remain five though, there's a LOT of potential for her to move on to the next level; going to kindergarten would probably mean she'll be attending Lakewood Elementary, and when that happens, you KNOW she'll continuously go out of her way to embarrass Arthur any chance she gets, meanwhile, if she ends up in some kind of trouble, Arthur's big brother instincts would kick in and he would certainly come to her defense.