In the book, they suggest that Aldrich Killian has contact with Hydra, which is consistent with the fact that in Agents Of S.H.I.E.L.D., the villain "The Clairvoyant" Centipede Project uses the Extremis serum.

It's also mentioned that in the Doctor Strange movie, Tina Minoru participated in the Battle of the Hong Kong Sanctum against Kaecilius and used the Staff of One as a weapon. Additionally, it's mentioned that in the Runaways series, she is portrayed by Brittany Ishibashi.

The book mentions that Phil Coulson wrote the report on the events of the short film "Item 47," which shouldn't be possible because that event takes place after the events of "The Avengers," where Coulson is killed by Loki. However, this is possible because he was resurrected with Project T.A.H.I.T.I. on Nick Fury's orders, as we saw in the Agents Of S.H.I.E.L.D. series.

The same book also mentions that the Helicarrier from "Avengers: Age Of Ultron" is the same one from "The Avengers," repaired and loaned to Fury—a detail previously exclusive to Agents Of S.H.I.E.L.D.

Also in the book, we can see an image of Anton Vanko, Ivan Vanko / Whiplash's father, when he was younger, who has the same appearance as when we saw him in the Agent Carter series.

The book mentions that the Agent Carter series marked the first time a character originating in the MCU would make the transition from the big screen to the small screen, with a canonical narrative that would eventually fit back into future films.

The book mentions that Joss Whedon was brought in to help with Thor: The Dark World and included the post-credits scene with the ice beast specifically for Agents Of S.H.I.E.L.D. to follow up on. Obviously, we know the show never did anything with it, but it makes sense that the team would have handled it off-screen, and that's where the DNA sample used in Secret Invasion would have come from.