[1] As a senior, Mangum was named the MIAS AAA, Division I Player of the Year after hitting .504 with 46 runs scored and 41 RBIs and compiling an 8-0 record with four saves, 66 strikeouts, and a 1.48 ERA in 52 innings pitched.

[2] Mangum originally committed to play college baseball at the University of Alabama, his father's alma mater, over offers from Ole Miss and Auburn.

[5] As a sophomore, Mangum slashed .324/.380/.385 in 65 games with 90 hits, 51 runs scored, 26 RBIs and 14 stolen bases and was named second team All-SEC.

[8] Mangum was selected in the 30th round (902nd overall) of the 2017 Major League Baseball draft by the New York Yankees following the season but opted to return to Mississippi State for his junior year.

[9] Following the 2017 season, he played a second summer in the Cape Cod League with the Hyannis Harbor Hawks and was named to the All-Star team for a second straight year.

[12][13] He was selected with the 950th pick in the 32nd round of the 2018 MLB Draft by the New York Mets but again decided to return to school, reportedly turning down a $300,000 signing bonus.

[16] He set the MSU single season hit record with 108 in his final career game against Louisville in the College World Series.

[19] Mangum finished his collegiate career with a school and conference record 383 hits (fourth in NCAA history) and at bats with 1,074, as well as school records for games played (262) and doubles (73) and finished second with 229 runs, third with 507 total bases, fourth with 56 stolen bases and tied for the 10th-highest career batting average at .357.

[25] Mangum returned to Brooklyn, now the Mets' High-A affiliate, to begin the 2021 season before being promoted to the Double-A Binghamton Rumble Ponies on May 22.