There's an abrubt pause after Tarkin says, "Terminate her--immediately!". I believe that this was the disc-flipping/switching transition point for the laserdisc. For the DVD, the transtion (for what I presume is a DVD layer-switch now) has been pulled off rather clumsily.
Interestingly, the Spanish and French audio tracks on the DVD appear to be based on the theatrical mono sound mix for the film (dubbed foreign-language dialogue aside). Certain sound effects are missing (such as all of the "exploding glass" sounds when Luke and Han blast the various cameras and such in the Death Star's detention center), and certain sounds have been added (such as metallic clicks when Artoo and Chewie press buttons on the holographic chessboard). Hmm.
Checking out a few scenes from Empire, the Spanish and French audio tracks also appears to be based on a different mix (possibly 70 mm) than the Definitive Collection/theatrical DVD version. There's a high-pitched engine whining sound as the last snowspeeder crashes (right before Veers blows up the Rebel power generators), and the TIE engine sounds in the establishing shot of Vader's ship (after Luke beheads the illusory Vader on Dagobah) are different.