Black Widow: 21 WTF Moments
14. "Red In Their Ledgers"
The film features an unexpected callback to the 2012's original Avengers movie, when Alexei says to Nat and Yelena that their ledgers are "gushing red."
This is obviously a nod to the fact that Natasha spoke to Hawkeye of having "red in her ledger" during a heart-to-heart in that movie, and later Loki (Tom Hiddleston) mentioned that her ledger was gushing red.
Interestingly, during Loki's exchange with Natasha, he also made explicit mention of Dreykov's daughter, laying the groundwork for the payoff in this movie almost an entire decade prior.