Season 2 starts off on the same day as the Tosei match. Rio gets home and his brother tells him to "contact Tajima and trap him in a pit or something." But how could Roka possibly have known that Rio was all buddy-buddy with Tajima now?
What are the circumstances that led to Mihashi living in Gunma? Based on his parents' dialog and one omake they were in Japan for at least part of his middle school years.
Mihashi's dad's side of the family appears to be financially well off, at the very least we know that his grandfather is the director of Mihoshi Academy. Mihashi's mom comes from a very different background; her parents died when she was still a minor but she nevertheless managed to support herself and graduate high school. The grandfather disproved of her background, and he did not give his permission for Mihashi's parents to marry. They eloped and lived simply at the Creaky Villa. After Mihashi was born, Mihashi's mom went to grad school while his dad was stay at home dad. When Mihashi was in preschool, his mom reconciled with her sister-in-law (Ruri's mother) and eventually also the grandmother. After some time, even the grandfather couldn't resist the draw of his cute grandson and re-established ties with Mihashi's parents. Beyond that is pure speculation, but perhaps the grandparents invited Mihashi to come to their school as part of the reconciliation between their families. Also they hadn't given their son and daughter-in-law any assistance when Mihashi was a baby, so maybe that was a factor too.
Abe mentions in episode 1 that he's watched Hanai play before. But Hanai played at the middle school level while Abe played at the club (Little League Seniors) level. What circumstances would lead Abe to watch Hanai play?
Season 2, episode 12.5 - Why does Kurata, the Bijoudai Sayama catcher, use polite language towards Kawai (Tosei's catcher) when they should both be the same age (18) and on the same level?
How could Kanou be so convinced that nepotism had nothing to do with Mihashi becoming Mihoshi's pitcher when it flies directly in the face of all available evidence? Namely:
1. He was pitcher for all 3 years of middle school. Meaning he was chosen as a first-year, when the team must have had second- and third-year pitchers already (and junior classmen must have come later). What's more he became the only pitcher for all 3 years.
2. His record was completely lousy, but he was not replaced. Regardless of his potential, no coach would keep fielding a pitcher that bad unless he had a reason to.
3. The 100% loss record would be awful for any baseball coach's career prospects and reputation. The only reason he would keep using Mihashi is if it would be even worse for his career not to do so.
4. Mihashi pitched all the time, even for consecutive matches. No ordinary middle-school pitcher would have the clout to insist on this, and no coach would do that to a player he actually valued.
5. At the practice game, the new coach mentions the only reason they accepted the game is because of the owner's grandson, so the favoritism is still in effect.
etc. Kanou is either so nice he can't admit it or too wrapped up in his personal rivalry fantasy that he can't think straight.