Revealing mistake: After the Kree arrive on the ship, in a side shot one of them opens the lunchbox holding the tesseract. We see the blue light emanating from inside, but that only appears once the box is fully open - while it's opening, there's no light inside at all, despite the tesseract always glowing. A later shot shows the glow being visible around the edges of the lid even when the box is completely shut, and when Carol opens it later, the glow appears immediately.

Captain Marvel (2019)
1 revealing mistake - chronological order
Directed by: Ryan Fleck, Anna Boden
Starring: Samuel L. Jackson, Brie Larson, Gemma Chan, Lee Pace
Factual error: Carol Danvers' name appears on her dog tags as "Carol Danvers," but US military dog tags list the surname first, then given name. E.g. "Danvers, Carol."
Carol Danvers: Did you have a rough day, Agent Fury?
Nick Fury: It was cool, you know? Had a space invasion, big car chase. Got to watch an alien autopsy. Typical 9-to-5.
Carol Danvers: So you saw one?
Nick Fury: I was never one to believe in aliens, but I can't unsee that.
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Answer: Howard Stark relinquished custody of it to her. For a full history of the Tesseract see here: https://marvelcinematicuniverse.fandom.com/wiki/Tesseract.
ctown28 ★