John Carpenter's weakest commentary, I think, was on this DVD, where he eventually just started narrating the film while repeatedly asking DP Gary Kibbe how he lit a particular scene.

The problem with the piece is that it starts out interesting, but very quickly becomes evident that the ONLY technical details we're going to get are about how Gary lit nearly every scene, and Gary seems bored to death with the whole thing, as if leaking this information would cost him his soul. After the first few secrets are pried out, it's kind of easy to figure out how he did the rest of the film. Even Kibbe HIMSELF seems somewhat exasperated when Carpenter asks him how he lit a confessional scene in order to get the pattern of the dividing screen on the actor's face! "Well, uhh, John, I stuck a light on the other side of it..." or something to that effect. This track has it's little nuggets of info, but they are few and far between, as they are on many Carpenter tracks outside of the jovial sit-downs he did with Kurt Russel for Escape from New York, The Thing and Big Trouble in Little China (the latter of which went seriously off topic to no real detriment of the film).

John Carpenter's comms are almost always excellent. Sadly, "In the Mouth of Madness" isn't among them. JC is usually very good when he has someone to bounce off of, but Gary Kibbe isn't the right man for the job, as the talk mostly consists mostly of techical camera talk which many people won't be familar with. It appears that JC and Kibbe themselves get bored and rather do something else. It's a damn shame that Sam Neil couldn't have been the one to have joined Carpenter.