Additionally, matte lines were removed in the heavy SFX scenes, and the guide track that the boulder rolled down on was digitally removed as it was visible in the original.
The sound mix was the biggest change, and while not a hack job like 'Star Wars' was, it still is different from the theatrical release. I prefer the DVD mix as the bass has been amped up considerably. The boulder sounds huge now. I am also a purist, so I still have the 'Raiders' laserdisc with the original sound mix.