In the last section of the shoggoth sequence when Walters rides the elevator to the ground floor I can't get the elevator emergency open button to light up. In videos and text walkthroughs I've seen this seems to happen automatically when Jack presses the G button. Is this a bug or am I missing something?

It's a bug, I guess, that the emergency door button doesn't light up or seem to function. After countless tries I discovered that I could climb out over the boxes and get a warm welcome from Hoover. even though the button didn't respond. It may not be necessary in this version??

I was about to give up when I discovered that even though the emergency button would not light up you can still activate the emergency hatch by pressing the button. This would have been a lot more obvious if they hadn't made it almost impossible to see anything as part of the effects of the elevator shaking. EVERY YouTube video I watched showed that you pressed the button when it lit up. Perhaps it doesn't light up in the current GOG version of the game?