K5 has a good writeup of supposed discrepancies in the Nick Berg video and circumstances. Here are some that caught my eye for further research.
27) Scream dubbed in: Screaming starts while Berg is not moving and before he is touched Whatever the mismatch in the speaker and video (next point), videotape cognoscenti have said the scream was amateurishly dubbed into the tape. The writer of this K5 article reviewed this issue closely: The screaming starts (at 4:31 - on the copy I viewed, not the time stamp) about 5 to 6 seconds before Berg is touched (at 4:36) and he is moved to his side. He is just sitting there like a lump.
28) Handling of papers on video "Terrorist" reader flips through pages of 'statement' at one point. He keeps ending up on the same page for awhile. As noted below, this would very likely produce a gap in speech, which is out of sync with the smooth timing of the spoken statement.
29) Audio is dubbed: Tape of speaker and video are out of sync Audio experts note the tape is clearly dubbed. The speaker recording is different from executioner video recording, due to lag between audio and video.
Personally, I'm still wondering why the events, when ordered by the timestamp on the video, seem to progress like the following.
Strange stuff.
Corrected last timestap. Sorry for the typo.