The Accident - S1-E1
Audio problem: After school when Alex and Ray are walking the camera is far away but you can see that the sound of the person that is talking is different than who is seen talking.
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.