Audio problem: In the scene where Mr. Eko dies, he starts saying "Psalm 23." He says the first line, but when it cuts to him backing away he's half way through (note: righteousness).
Audio problem: When Mac and co. enter the basement of the house in Queens (the one where the third woman was found) the record player lifts off its needle and moves to another spot on the record, cutting off the sound for a second. However, the music starts again slightly before the needle hits the record.
Episode #3 - S1-E3
Audio problem: When Muhammad is meeting with the group of Al-Quaeda leaders in the desert, the movements of his mouth do not match what he is saying in the foreign language.
Graduation Match: Part 1 - S1-E51
Audio problem: After Jaden and Zane shake hands and the duel starts, there is a wide shot of the arena where the students are heard cheering for them. But the students all appear to be sitting completely still and motionless, and their mouths don't move in any way. (00:06:35)