[6] In one playoff game against Lincoln High School he recorded 25 points, 20 rebounds and five blocks in an overtime win.

[5][6] Mitchell attended a public high school in Atlanta (Dutchtown High School) for his freshman year then in Dallas sophomore years, but under the advice of his Amateur Athletic Union basketball coach he transferred to Center of Life Christian Academy (CLCA) in Miami.

[7] What he did not realize until the latter portion of his junior year there, however, was that CLCA was not an accredited prep school, and therefore only a fraction of his coursework counted toward NCAA eligibility.

[7] To make up for lost time at CLCA, he attempted to take make-up classes at a faster rate than the school district allowed.

[7] After sitting out the 2010–11 season due to his eligibility issues, Mitchell officially began his collegiate career as a redshirt freshman in 2011–12.

[6] Mitchell was named to the All-2012 Sun Belt Conference tournament team after leading the Mean Green to the championship game before losing to Western Kentucky, 74 to 70.

"[10] Some of the preseason watchlists and honors that Mitchell received included being an All-American according to numerous media outlets; a John Wooden Award Preseason Top 50 player; being featured on the October cover of Basketball Times; Lindy's number two ranked center in college basketball; and CBS Sports' number seven overall player in the country.

"[11] Mitchell's per-game averages lowered in four of the five major statistical categories from his freshman season: 13.0 points (down from 14.7), 8.5 rebounds (down from 10.3), 0.8 assists (down from 1.6), and 2.7 blocks (down from 3.0).

[13] Midway through the season, Bleacher Report wrote an article which questioned Mitchell's ability to lead a team, noting that a player of his caliber should have been a bigger factor in games played in a mid-major conference.

[9] The article also said that his All-American candidacy took a severe blow, and that his per game averages would be more impressive if he played for a stronger Division I program.

While not making an appearance for the Pistons in the 2014–15 season, Mitchell was assigned multiple times to the Grand Rapids Drive.

[22] On February 5, 2015, Mitchell signed with Atléticos de San Germán of Puerto Rico for the 2015 BSN season.

[28] On late February 2017, Mitchell signed with the Star Hotshots of the Philippine Basketball Association as the team's import for the 2017 PBA Commissioner's Cup.

[34] In April 2019, Mitchell signed with the NLEX Road Warriors of the Philippine Basketball Association as the team's import for the 2019 PBA Commissioner's Cup.