How to reproduce:
If the ISO is burnt to a CD, simply insert the CD and check the name of the volume that appears on the desktop.
You can also check the label of the ISO file without burning it:
Make sure the genisoimage package is installed (it contains the command isoinfo)
Type isoinfo -d -i filename.iso in the terminal
The ISO label is the value that appears next to "Volume id".
What to expect:
The ISO volume ID (or CD name) should contain:
The name "Linux Mint"
The release version
The name of the edition (unless it's Gnome, in which case it doesn't mention it)
The architecture (32-bit or 64-bit)
For instance: "Linux Mint 10 KDE 32-bit"