Elsa Pataky and Chris Hemsworth are married. This is the second movie they've collaborated on after 12 Strong (2018).
The Russian sniper on the submarine who kills Kessel at the end is film director and stunt coordinator Sam Hargrave who directed Chris Hemsworth in the movie Extraction.
An Easter egg of sorts - between the ending credits and the detailed credits the movie continues with a nine second shot of the TV salesman (Chris Hemsworth) relaxing in a mechanical massage chair after all the excitement of the afternoon.
The Platform is loosely based upon the SBX-1 or Sea-Based X-band Radar, which is a mobile floating Early Warning RADAR to track incoming missile attacks and direct outbound Anti-ICBM or ABM Interceptor Missiles.