Factual error: The ferry splits in half down the middle, enough so the water is flooding in dramatically as the split grows. There is no possible way that the two halves of the ferry could have remained afloat like that. It would have sunk immediately. Then, as Iron Man "welds" the two halves back together, the ferry is afloat at the same waterline as before the incident, certainly not feasible with all the water it took on.
Spider-Man: Homecoming (2017)
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Directed by: Jon Watts
Starring: Robert Downey Jr., Chris Evans, Tom Holland, Martin Starr
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Suggested correction: You're forgetting all the cars that the ferry lost. This would even out the weight to roughly what it was before.
Peter Parker: I'm sick of Mr. Stark treating me like a kid.
Ned Leeds: But you are a kid.
Peter Parker: Yeah. A kid who can stop a bus with his bare hands.
Trivia: Jennifer Connelly voices the "suit lady", the AI in Spider-Man's suit. In real life she's married to Paul Bettany, who voiced Jarvis, the AI in Iron Man's suit, and who later played Vision.
Question: Why did Vulture spare Spider-Man at the end?
Answer: Several reasons, the Vulture isn't really a super villain, but a man trying to provide for his family after being cheated by the government. He also can make Peter Parker squirm with fear knowing that he's Spider-Man. What will he do with that knowledge.