In the comics, Colonel Ernst Mueller fought the Howling Commandos as a member of Baron Wolfgang von Strucker's Blitzkrieg Squad.
Aside from Howard Stark, the airfield log contains names of the filming crew, most notably Peter Tothpal.
The first time Peggy let's Howard into her room at The Griffin, her door in the hallway is dark green. The next time it's cream.
Stan Lee: co-creator of Peggy Carter, Edwin Jarvis and Howard Stark, is having his shoes polished next to Stark and Jarvis. After Jarvis leaves, Lee asks Stark to borrow the sports section of his newspaper.