When Mr Burns shows the bottle of "Brain & Nerve Tonic", the ampersand switches between having its tail on the left and on the right.
The bases are supposed to be loaded when Homer bats in the championship game, but there is no one (fielder or runner) at third base as Burns signals him.
When Homer was carving his baseball bat in bed, the wood chips on Marge were purple like her nightgown.
How could Smithers have found out what happened to Steve Sax and Ozzie Smith? The police made it clear they were not letting Sax call anybody. Plus the only witness to what happened to Ozzie would not have known to tell Smithers about it.
It would be physically impossible for Smithers to travel across America and track down all the baseball players over a period of 24 hours. Particularly as some of them were hunting in the woods, on vacation at Graceland, or playing the cello in a nightclub, so how would he know where they were? It would be easier for Smithers to call their managers or agents and book the players that way.