Short answers, pulled from the story.
Olympic Stadium is nicknamed the Big Owe because of the enormous cost of building it and hosting the 1976 Summer Olympics. The debt was not fully paid off until mid-November 2006, more than 30 years after the stadium opened, at a total cost of C$1.61 billion.
The Montreal Tower stands 165 meters tall and is inclined 45 degrees from vertical at the stadium's north base. It is the world's tallest inclined tower and was not completed until a full decade after Olympic Stadium opened.
The Montreal Expos left after years of poor playing conditions, including thin AstroTurf laid directly over concrete and thin fence padding the Olympic Installations Board refused to replace. Owners Claude Brochu and later Jeffrey Loria both campaigned for a replacement venue, and the franchise moved to Washington, D.C. for the 2005 season to become the Washington Nationals.
On the 8th of August 1992, Metallica frontman James Hetfield was accidentally burned by faulty pyrotechnics during the song Fade to Black, cutting the band's set short. After a long delay and a shortened Guns N' Roses set, an estimated 2,000 fans rioted inside and around the stadium, causing about $600,000 in damage.
Willie Stargell of the Pittsburgh Pirates hit the longest home run recorded at Olympic Stadium, an estimated 535 feet into the second deck in right field on the 20th of May 1978. The seat marking where the ball landed was later moved to the Canadian Baseball Hall of Fame.
The roof at Olympic Stadium has failed repeatedly through tearing, weight limits and weather restrictions since it was first completed in 1987. By May 2017 it had accumulated 7,453 tears, and the Olympic Installations Board has said it is unsafe during heavy rainfall or snowfall over 8 centimeters.