There is a surprising amount of differences between the floppy and CD version. Notice how Smirk’s cigar doesn’t emit smoke, for example. There are also brightness differences, which experts have described as: MI1 doesn’t have dynamic lighting but it does change the brightness of sprites on a per scene basis to suit the scene. The CD edition of course missed this, in a long line of re-release fuck ups. 
  Perhaps the oddest difference: After rebounding from the rubber trees on Monkey Island, Guybrush says Rubber tree.  in the floppy edition. In the CD-ROM version: Rubber tree!  Visual proof here.
  View the main differences.
 
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