Yeah, I think the version of Maniac Mansion that comes with DOTT is the original release, which has more basic graphics & sound and only one save slot. You can take it out of DOTT and run it in DOS or ScummVM separately if you rename MANIAC.OVL to MANIAC.EXE.
The updated Maniac Mansion Enhanced version has more save slots, which is the version that comes with DOTT Remastered.
