Prey of the Black Panther - S2-E7
Audio problem: When Black Panther is saying "The Black Panther's ready to stalk again," he doesn't press his lips together when saying "Panther" in order to produce the "P" sound. (00:21:12)
Six Forgotten Warriors Chapter 4: The Six Fight Again - S5-E5
Audio problem: When Dr. Groitzig is saying "It's been so many years," he has his fingers in his mouth. While it's possible to speak with fingers in your mouth, your voice will sound quite different when doing so, and Groitzig's voice sounds normal.
Origin of Iron Man: Part 1 - S1-E11
Audio problem: When Fin Fang Foom is saying "I'll do nothing for you, until you agree to do something for me," his mouth is hardly moving for any of the words. (00:04:05)