Continuity mistake: Vada loses the right handlebar streamer in the garage, but later in the movie it's the left streamer that is missing. At the very end we see that she has both streamers. (00:35:15 - 01:16:25)
Factual error: In one scene, Vada is showing off her mood ring. The movie is set in 1972 and mood rings were not created until 1975.
Audio problem: At Thomas J's memorial service, Vada goes up to the coffin crying. Just after she says something about his glasses being missing, her father comes up to comfort her. Watch his mouth - he is heard talking but his lips aren't moving at first (they are in the next shot).
Continuity mistake: In the scene where Thomas J. pulls the fish out of the water, the hook falls out of the fish's mouth twice.
Audio problem: When Vada and Thomas J are running away from the bees, Thomas J yells, "Run faster, they're after us", but his lips aren't moving. Neither does Vada's, when she replies, "I am running faster."
Visible crew/equipment: When Thomas J. is leaving from his porch, after Vada tries sneaking him out of his house to go spy on her dad at the Bingo game, if you look down at Thomas J.'S shoes after he steps off the porch, the red tape mark is visible.
Factual error: The pirate ship ride was not invented until 1981; however, it appears at the carnival that is supposedly taking place in 1972.
Answer: She still died due to complications from childbirth, despite living another couple of days. Hence why Vada believes that she "killed" her mother. Jane Seymour, the third wife of Henry VIII, also died from complications, but she lived for two weeks after.
To add an additional example to your accurate answer, a condition like postpartum pre-eclampsia (extreme hypertension) can occur from a few days to six weeks after giving birth and is sometimes fatal.
raywest ★