There seem to be quite a few different releases with different content.
There are the (at least to me) most common versions from Software Corner
Dragon's Lair [SC 426020-1]
Thayer's Quest [SC 426020-2]
Mine came together in a box:
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With an additional picture:
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The box has room for much more, so maybe some extras are missing.
Then there are two RDI discs but it is unclear where are the differences.
590-0002 has a metal plate on the dead side. Likely for an arcade machine. Never seen a 590-0001.
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Then there is a two sided release that starts with Halcyon and RDI logos.
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The two labels are slightly different. I think, the content is the same but the sides are reversed between the two discs. I've only done a short check.
So far I haven't found any other Dragon's Lair discs.
Does anyone know more about the different Thayer's Quest versions?