The issue of whether drugs should be legal is orthogonal to the question of whether it's a good idea to take them.

"If the people on the escalator are going down backwards it means in forward time they would be going up forwards, yet she is on a different escalator also going up forwards. Two up escalators?"

Uh, the escalators are going in opposite directions. That remains true whichever way round you play the video.

In real life, she was facing upwards on a down escalator (so she couldn't see where she was going). When the video is reversed, she is facing upwards on an (apparently) up escalator.

Nothing strange here.

@AVRAM

I was about to post exactly the same thing. Sound in space doesn't bother me at all, provided the sound can exist at the source.

Another common example of this technique is when a film is showing a crowd scene at a sporting event. There can be hundreds of people in view, all making a lot of noise. But you can hear two people conversing with each other perfectly, even though from the camera's 'position' you couldn't possibly hear them.

It's not a science error; it's a technique.