Short answers, pulled from the story.
Andrea Bargnani became the first European player selected first overall in NBA history during the 2006 NBA draft. He had spent three years playing for Italian club Benetton Treviso before arriving at Madison Square Garden on the 28th of June 2006.
The collective bargaining agreement between the NBA and the National Basketball Players Association took effect immediately on the 28th of June 2006. High school graduates now had to wait at least one year after finishing high school before becoming eligible for selection under these new rules.
The University of Connecticut became the first school ever to have five selections within a single two-round event during the 2006 NBA draft. Five players including Rudy Gay, Hilton Armstrong, Marcus Williams, Josh Boone, and Denham Brown were chosen across both rounds.
Portland Trail Blazers acquired Brandon Roy's rights through a trade involving seventh pick Randy Foye on the 28th of June 2006. Roy went on to win Rookie of the Year honors during the 2006, 07 season despite never being originally chosen by Portland.
The Toronto Raptors secured the top pick despite holding only an 8.8% chance of winning the lottery held on the 23rd of May 2006. Their record stood at 27 wins and 55 losses placing them fifth worst overall heading into the draw.