Audio problem: When Zedd, Rita, Goldar and Mordant are at the building site to free Ivan Ooze there is a moment when Mordant says "I could do that, I just choose not to" however his mouth continues to move long after he has said this. (00:11:16)
Audio problem: Billy swings across the construction site to help Aiesha, he then stamps on some ooze men's heads. He counts each stomp up to 6 and we hear 6 stomps. However there are only 3 ooze men, and we can plainly see Billy doesn't stomp any more than once. (00:25:25)
Answer: There's never a "point" to including a weakspot, by definition they are a flaw in the design that is either unforeseen or unavoidable. Maybe they could not find a way round it when building the robot, or any solutions simply created other weakspots.