The NES version originally allowed you to put the hamster in the Microwave.
Once Nintendo became wise to this, they forced lucas Arts (or who ever) to remove that option.
I am currently playing through maniac Mansion Deluxe via ScummVM on my DSiXL.
Yes Nintendo had some strange rules back then, the same when i play Wolfenstein on the SNES, the dog are rats, and Hitler has no mustage, it looks quite weird