The Inferno - S5-E20
Audio problem: While Johnboy and the press guy park, the Hindenburg is hovering over the aircraft field, while audible voices cheer alongside clapping and shouts. Yet, there is no visible crowd, but a small scattering of Naval comrades on the field. (00:17:23)
Arthur, the Invisible Bear - S2-E4
Audio problem: When the station wagon pulls into the mountain clearing there is no movement with the trees indicating they are on a sound studio, as some of the dialogue is acoustic. (00:24:00 - 00:24:30)