- When Tony goes through his father's case an old Captain America comic book can be seen inside; later he uses Captain America's shield (a prototype) to build a reactor
- when Tony is watching the old reels of his father and going through his notebooks, one of the sketches is of a tesseract, drawn in the form of a so-called "Schlegel diagram". The Tesseract is a very important item in both Captain America: The First Avenger and Avengers Assemble
- a news report of The Incredible Hulk's campus battle is seen near the end of the film
- Stark and Fury discuss Stark's membership throughout the film
- and Agent Coulson finds Thor's hammer in a crater in the post-credits scene.