Being an avid watcher of Air Accident Investigation and other documentaries of that ilk, the one that always makes me cringe (and not due to the subject, which is absolutely horrific)....the one that covered the loss of JAL123.
The programme is very well made & the recreation of the last 30 minutes of the 747 is extremely realistic.....but...after the plane has gone down and the USAF are overflying in a C130 and told to return to base...the sound effects man got the wrong button, cos it sounds more like a Cessna 172....but its easy to make a mistake and it doesn't really impact the story...it just bugs that since they made such a superb job of the rest of the film, they let a simple sound effect error like that happen
The best, or at least one of the best, howlers to me was the Poldark oil tanker...and another was the Pirates of the Caribbean helicopter (the same helicopter appeared in Master & Commander too, amongst other sailing ship films & telly series).....
a case of always look where the sun is when filming cos you get some really dodgy shadows sometimes