I know we are 8 months on from your original comment, but did you ever find out?
I am not sure he wrote any whole scenes but I do know he "punched up" some of the dialog here and there.
The two examples I can think of off the top of my head are:
1) The speech Ramius gives to the crew about their mission...."It reminds me of the heady days of Yuri Gagarin and Sputnik..."
2) I believe he also wrote the line in the dinner with the defecting officers scene regarding Cortez burning his ships when he reached the new world and, as a result, his men were well motivated.
Past that there may have been others but I can't remember offhand
Those seem like likely examples of things he’d write. He seems like a true fan of history. Similar to the first scene in Red Dawn where the teacher is describing Genghis Khan’s (I think) great hunt.