7. Dumping Bojan Bogdanovic prematurely
Hindsight is 20/20. If the Wolves had known Bojan Bogdanovic would turn into a 15-plus point-per-game career scorer, this trade wouldn't have happened. However, Bogdanovic was drafted in the second round of the 2011 NBA Draft as a 22-year-old—just four days after signing a multi-year deal with a European squad.
Bogdanovic starred for Cibona Zagreb and Fenerbahce Ulker before coming stateside. He averaged 13-plus points per game in every season suiting up for Fenerbahce. While draft-and-stash prospects don't have the highest hit rate, Bogdanovic turned into a borderline All-Star in the NBA despite starting his career at 25.
As soon as Bogdanovic hit the hardwood he averaged 9.0 points on efficient shooting metrics. After several solid, all-around seasons, the Croatian wing broke out in Indiana and saw his best seasons come as a member of the Utah Jazz.
Seeing the future would've been nice in this instance, but Minnesota likely didn't know of Bogdanovic's ensuing usefulness. The original trade occurred on June 23, the night of the 2011 draft.
Unfortunately for the Wolves (and the Miami Heat who actually drafted him), Bogdanovic turned into a terrific wing player acquired only for a future second-rounder and cash considerations. The Nets struck gold acquiring the 6-foot-7 sharpshooter.