I used to work production sound recording when I was a lot younger, the sound guys likely unplugged the fridge because the compressors when they're running (on an automatic switch) makes an aweful humm that's a bi!@# to edit out later but can be done... or we just unplug the fridge and get rid of the sound from the recording. Why the microwave was unplugged is maybe because it had a clock on it (the edititor's bane), maybe they unplugged both not knowing which one was the fridge and teh fridge wasn't running at the moment, etc. etc.. The unplugged fridge is SOP, the unplugged microwave is a coin-toss, so a little suspicious but definetley far from unheard of in production recording/filming.