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 platform designed to track incoming missile attacks and direct outbound Anti-ICBM or ABM Interceptor Missiles and is usually stationed at Adak Island in Alaska. Although in real life the platform is not armed with missiles or any other weapons and is not operated by the military, the radar systems are operated by civilian employees of the Department of Defense's Missile Defense Agency and the vessel itself is operated by the Navy's Military Sealift Command, which is staffed with civilian sailors called Merchant Mariners.