The bonus material includes some early photo-realistic images, including a vase that morphs...
... and a transparent head. Pretty advanced stuff for 1981.
The coolest bonus stuff though is a short CGI clip done in 1978 of some X-Wing fighters.
For 1978, this stuff was jaw-dropping. ILM was impressed.
But apparently not quite enough to commit to using CGI... yet.
to the review)