Factual error: None of the Swedish wedding traditions Ingrid mention actually existed in the 19th century and the bread she's baked is not traditionally Swedish. When she later speaks in her mother tongue it's definitely not Swedish.
Factual error: Horace catches the ball during the first half of the final competition as Otis approaches 4th base/pitcher's mound, which outs him automatically yet Michaela nor the team call it.
Suggested correction: He was out. It was obvious that he was out when Quinn said he caught it. There would be no point in having to call him out. Otis is then seen telling his players to return to their bases because they could be tagged out. But he doesn't bother going anywhere because even he knew he was out. And we do see the players get called out.
Factual error: In the later seasons (4-6) all the characters keep referring to their location as 'Colorado Springs' instead of just stating 'here'. Example: "I told him to stay in Colorado Springs" instead of just stating "I told him to stay HERE"