The Honking - S3-E1
Audio problem: After they have welded Bender to the wall Leela and Fry leaves. When they go outside the door is closing. It cuts and we hear the door close but we can see the door is already closed. (00:11:45)
Destiny (2) - S1-E22
Audio problem: At the end of the episode, Michael suddenly appears next to Max without any footsteps on the gravel like Max's and Liz's. (00:41:35)