“The Amazing Spider-Man 2” swung into North American theaters with a $91.6 million debut, kicking off Hollywood’s summer season. Studios released their final box office numbers from the weekend Monday, and Sony’s second installment of its second Spider-Man series performed solidly if not spectacularly. 2007’s “Spider-Man 3,” by comparison, opened with $151.1 million. Sony has a lot riding on Marc Webb’s version of the web slinger, starring Andrew Garfield and Emma Stone. It has plans for two Spider-Man sequels and two spinoffs.
