[1] After sixteen years at the club Steven Anderson left before the season began along with Danny Swanson, Ross Callachan and David McMillan.

[4] The Saints dropped to the bottom of the table after four games without a goal,[5] but after a 5–3 away win at Hamilton they moved off it.

[7] On 28 February 2021, St Johnstone defeated Livingston in the final thanks to a single goal from Shaun Rooney.

[8] On 22 May 2021, St Johnstone won the Scottish Cup, defeating Hibs by a score of 1–0 in the final, with Shaun Rooney again netting the winning goal.

With the victory, St Johnstone became just the fourth club in Scottish history to win the cup double after Aberdeen, Celtic, and Rangers.