The Calculus Affair: Part 1 - S1-E12
Audio problem: After the bullet is shot at Calculus's hat, Tintin says "That sounded like a gunshot... outside". After he says "gunshot...", his mouth starts moving as if he is speaking before he even starts to say "outside". (00:06:40)
Doug Graduates / Doug's Bad Trip - S4-E11
Audio problem: Doug Graduates: When the kids are getting their diplomas at the graduation, as Patti says, "Where's Doug? He's gonna miss his turn," her mouth doesn't move. (00:10:13)