The US is cheap. We even famously have large gaps between the door/stall panels. I can only imagine it is to accommodate temperature/humidity changes so that they don’t jam.
Nicer places sometimes have actual deadbolt locks connected to a vacant/occupied indicator on the exterior. But it is rare. Usually it’s just a gapped stall with a sliding lock that will often not even line up correctly without wiggling the door.
In some instances I have had to use my gym key fob in place of the missing sliding mechanism to secure the door.
Edit to add: Bert literally stops the movie at one point to fourth-wall how hopeless everything looks. Ernie reassures him by asking what kind of movie would have a sad ending. Bert immediately replies Titanic.
They do. Even back in their pre-UEFI days, it was possible to flash BIOS from a properly-formatted USB drive by holding down a magic key combination at power on. But it was not exactly publicized as a supported method.
They really didn’t give much direction at all on how Klingons should look back then. The actor and makeup artist basically came up with it on the spot.