Here’s some more:
1941: The “Director’s Cut” of this Spielberg bomb has a few slight sound additions.
Duel: Spielberg’s first film has also been ruined by its remastered version. I don’t know what sounds they added or changed, as I haven’t seen the movie. I’m guessing they changed the truck’s horn or something like that.
Halloween (1978): Apparently, modern thunder noises have been added, which I couldn’t detect when I went to a special screening a couple years ago. EDIT: They also added tons of atmospheric insect sounds in the nighttime scenes. When Annie is inside of her car, you can still hear the insects even though she is supposed to be inside.
Mad Max: Severe alterations in the 5.1 mix, and there are even some original ones that have gone missing!
Psycho: Tons of added foley to scenes that are supposed to be silent. The worst thing is that this even includes the famous shower scene, where they added new water foley effects and squeaky faucets.
In The Heat of The Night: I have never seen this movie, but it apparently suffered a lot when remixed in stereo. This includes annoying ambience sounds (they added a distant train horn, for Christ’s sake!), and horribly reverbed audio (Ray Charles now sounds like he’s singing in a bathroom).
The Sound of Music: Not only are there modern thunder and rain sounds at one point, but some original sounds are absent!
Vertigo: One of the most infamous remixes of all time. The 5.0 remix on Blu-Ray removes most of the added foley (gunshots and footsteps), but there’s still some ambient wind sounds.
Rocky (the first film): Added foley and out-of-place reverb (why is there reverb in a parking lot?).
The French Connection: New car sounds and city ambience. Luckily, the Blu-Ray includes the mono track.
Evil Dead (the original): Several random sounds are missing in the stereo remix, possibly a side effect of the severe noise reduction applied.
The Conversation: Added foley, which has the result of making everything sound too busy. This one also has the mono track included on Blu-Ray.
Chinatown: Pretty much every time a gun is fired gets changed, as well as every scene of Jack Nicholson in a car. Another one where they have the mono included on Blu-Ray.
Butch Cassidy and the Sundance Kid: Another awful mess of added foley and insect noises. Even when the characters are inside with closed windows, you can still hear the insects! Horse hoof noises are also replaced, as well as all the explosions. The mono is featured on this Blu-Ray, too, but only on the American release.
Barry Lyndon: Another movie I’ve never heard of, this one has altered explosion sounds.
I want to give credit to the Bad Audio on Blu-Ray blog for some of these examples.
EDIT: Looks like I can add another movie to this list; My Favorite Brunette, which I’ve never seen. According to an irate Amazon customer, the Blu-Ray released by Kino last year has added modern foley effects such as doors opening and paper crinkling.