- When Stark and Banner were talking between the computer screen, Banner's reflection on the screen was the Hulk.
- Cap kind of had a gut feeling about Loki's plan even before Black Widow got it out from him, "Loki's winding us up". And you can see that Cap and Stark were sweating / clutching their heads as if they were being influenced too.
- Loki joking with Thor that humans think a 30,000 death trap drop would kill them.
- After Thor falls off the sky, rather than call for his hammer like he did the entire film, he clutches his fist and just tries to pick it up normally as if asking himself if he is still worthy (the theme in his Thor film).
- The Other telling Thanos "to fight them, is to court Death" is actually a comic book reference, since Death is a character with Thanos.