The Show's writers/producers are lazy and sloppy
1. As I pointed out earlier, the kid's favorite baseball player (Frank Viola) stopped playing for his home team 7 or 8 years before the kid was even born.
2. The kid can't even pronounce the name of his supposedly favorite player (It's VI-ola, not VEE-ola).
3. The kid is impressed with how good the soccer players in Puerto Rico are, as if Puerto Rico is some hotbed of soccer. I guess we're supposed to assume this because the population there is Hispanic. In fact, soccer is probably less popular in Puerto Rico than it is here in the states - a distant third, at best, behind baseball and basketball.
4. Anytime the storyline needs a lift they conveniently kill someone off, and anytime the situation or the dialog gets a little mundane they throw in an "F" bomb to liven things up.
Granted, these are relatively small points, but really, really, good shows like Mad Men, Breaking Bad, The Wire, etc. pay inordinate attention to even the smallest contextual details; the plot lines take unexpected yet logical turns; and conversations between the characters are believable.