Each release has its differences. The pre-1995 video releases feature the mono but with the replaced song. 1995-1999 video releases feature the mono with the restored song and a few minor differences. Not changes just things that were more drowned in the mix now stand out more (Cassidy’s ‘burp’, dialogue in the scene when shark tugs boat). The 2000 DVD/VHS was the first to include the surround remix that rerecorded all the sound FX and did NOT include the mono. The 2005 DVD included the mono and the remix. This mono was mostly identical to the mono from the pre-1995 releases but with the restored song. The mono on the Blu-ray is mostly identical to this mix but with a few minor differences which I noted a couple posts ago. Additionally the surround mix on the Blu-ray is an upscale of the previous surround mix but with a few original sound FX restored.