Continuity mistake: Ursula is standing with the field to her right, and the snack cart to her left. She his hit by a flying baseball coming from below and to the left of her that supposedly comes from the field.
Continuity mistake: When Rabbit pulls over the Porsche, he looks at the woman first. When the camera scans from the womans lap to her face, you see her head is farther back towards the seat then it is in the next shot when she's leaning forward.
Answer: It's "Bidibodi Bidibu" by Bubbles (or sometimes referred to as DJ Bubbles).