Last year during the press tour for Avengers: Infinity War, Marvel famously paired up Benedict Cumberbatch with Tom Holland to stop him from spoiling the movie. The result was a great video someone did that compiled all the time that Cumberbatch had to stop Holland from saying something in an interview. It looks like it may have missed one time though.
An interview with Access was discovered where at the 5:28 mark of the video below the two are asked about flubbing a line, and Tom Holland says that Cumberbatch has the most difficult lines because he has to “talk so much about Quantum Realm…stuff.”
There’s no mention at all of the Quantum Realm in Avengers: Infinity War. At the time of that movie it was something mentioned in the first Ant-Man and never since. Now, after Ant-Man and The Wasp most MCU fans are well aware of the significance of the Quantum Realm. But last April before that movie was released is a strange time for the name to pop up in an Avengers interview. Now it could be a spoiler, especially with all of the rumors that the Quantum Realm will play a big role in Endgame.
So if what Tom says really is a spoiler that he let slip, then Doctor Strange might be explaining some Quantum Realm stuff to the Avengers…even though he’s dust right now.