[GauntletWizard]

The full movie is free on Youtube (In the US, anyway): https://youtu.be/iHil4Y4r3Wk

And a link directly to that scene: https://youtu.be/iHil4Y4r3Wk?t=2748 and the other time they show it: https://youtu.be/iHil4Y4r3Wk?t=3297

Moreover, this almost makes sense as a security mechanism. A keyboard is a one-way input device; You don't get feedback from it. A monitor provides feedback that's fuzzy - Harder to exploit via a visual image where you're expecting and parsing text than a direct digital link.

[kuschku]

You can use opto-electronic isolators on a direct digital link as well.

You could also just connect up to the computer via TOSLINK, that has no backchannel and no risk of interference either.

[GauntletWizard]

That's the "Almost" in almost makes sense :)