Continuity mistake: Billy's sunglasses disappear between shots, when him and Katie are driving along and then their parents pull alongside them.
Continuity mistake: We see Billy and Katie laying in beach chairs on the deck. In the frontal perspective, the end of Katie's blue hair ribbon is resting on her chest. Cut to a side view, and the ribbon is suddenly on her shoulder.
Continuity mistake: Billy slides into home, and as he gets up, the catcher is in front of him. Cut to a different angle as Billy's teammates run in to congratulate him, and the catcher has disappeared.
Continuity mistake: Billy is on deck at the baseball game, and Appleby comes and kneels down next to him. They talk, and Billy gets called up to bat. Billy starts walking away, and Appleby takes his cap off and smooths back his hair. When the shot changes to a wider view, Appleby takes off the cap and smooths back his hair once again, as if he never did it the first time.
Continuity mistake: Billy is hitting some pop-up balls to his dad in the backyard. Dad's shirt is dry as a bone when we see him in the wide shot. Cut to a closer perspective, and he suddenly has huge sweat stains under his arms and around his midsection.
Continuity mistake: The amount of drink in Billy's and Robin's Pepsi bottles increases.
Continuity mistake: In a wideshot of Billy at bat, we see a group of extras in the background. About half of them are covered by the dark shade of a nearby tree. The shot changes perspective, and these same people are now all in full sunlight.