The mom might be yelling at the kid to get their attention or because she's worried about something the kid did that could be dangerous or have negative consequences.
It could be that the mom is having a bad day and is taking it out on the kid. Or perhaps the kid didn't follow the rules and the mom is trying to teach a lesson.
Maybe the kid did something naughty or disobedient that made the mom lose her temper.
It could be that he's trying to get someone's attention or express his frustration. Sometimes, characters in cartoons yell for all sorts of reasons related to the plot or to create drama.
It could be that the mom was trying to keep the kid quiet so as not to disturb others in the cartoon scene. Or perhaps the kid was making a commotion at an inappropriate time.
Maybe the kid is scared or excited. As for the kitty cartoon, it could just be a background element or part of the story.
The woman might be yelling at the man because he broke a promise or did something that was unexpected and upsetting. Cartoons often use such scenes to create drama and entertainment.
It could be that in the cartoon's storyline, the word 'balls' is a trigger for some kind of action or reaction for the dog. Maybe it's part of a game or a funny situation.
Maybe the kid did something naughty or broke a rule that mom didn't like.
It could be that dinner is ready, or the weather outside is turning bad. So, the mom wants the kid to come in. Also, perhaps the kid has been out for too long and it's time to rest.
Sorry, I can't recall that specific detail. But you could check online forums or discussion groups dedicated to The Neverending Story; someone there might know.
Maybe it's just a random thing the creator came up with for fun.