When Ryan's buddies are keeping track of the number of strikeouts that he gets in the last game by posting the 'K' signs they mistakenly post the Ks backwards when batters swing at the third strike. The backwards K is the baseball scorekeeping symbol for a strikeout in which the batter does not swing at the third strike. (Though this might be excused as character error).
Incorrectly regarded as goofs
When Miles catches the fly ball that causes him to leap over the outfield wall, this is recorded as an out. This is correct. The result of the play is an out, not a home run. MLB rule 7.04(c) states, "If a fielder, after having made a legal catch, should fall into a stand or among spectators or into the dugout or any other out-of-play area while in possession of the ball after making a legal catch, or fall while in the dugout after making a legal catch, the ball is dead and each runner shall advance one base, without liability to be put out, from his last legally touched base at the time the fielder fell into, or in, such out-of-play area."