These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fan-Preferred Couple: It may be that they're just more vocal, but Dani/Nico appears to be more prominent than Dani/Matt.
Whether or not your mileage varied, it seems the show has responded. As of "All The King's Horses", Nico and Dani share a kiss.
Gretzky Has the Ball: An episode where a #1 baseball prospect is expected to be drafted by Kansas City is treated like he's moving to Kansas City. Even #1 high school prospects (like Bryce Harper, who is a potential "once in a generation" like player), take several years in the minors in baseball, typically nowhere geographically near the parent club before making it to the majors, and even that is not a given. Football and Basketball will see jumps from amateur to the highest level all the time, but rarely in baseball.
Averted when Hutch shows up again later. It's explicitly stated that he's currently playing in the minors and that if he does well there, he'll get called up to The Bigs (the major league). It may have been that KC was intended to represent the minor league team rather than the major league one or that sometime off screen he was traded.