After Capt. Peyton falls out of the taxiing Tri-motor and is chasing it, only one of the three engines is running, the center one. A moment later when the Capt. Peyton is being chased by the taxiing Tr-Motor, all three engines are running.
When Willard throws the ball back over the ballpark fence, it bounces directly in front of the catcher facing center field so he can field it and tag the sliding base runner. However, when Willard climbs back over the fence, he's in right field, so the ball's carom would've been different.
Right after Capt. Peyton grabs onto the tail as it is taxiing, you can briefly see a pilot wearing a khaki-colored shirt sitting in the right seat in the cockpit.