[6] Heidi Gardner worked part-time at the Tivoli Theater in Kansas City as a child, where she did everything "from selling tickets to making popcorn".

[8] At age 21, Gardner dropped out of college and left Kansas City for Los Angeles, where she worked at a hair salon for nine years.

[10] After her first year on SNL, Gardner was hired to play Leonor in the Ben Falcone-directed film Life of the Party, alongside Melissa McCarthy, Falcone's wife.

[8] On August 28, 2019, TVLine reported that Gardner would have a guest role on the NBC comedy series Superstore, playing Dina Fox's nemesis Colleen who is transferred to Store 1217 after Cloud 9's Bel-Ridge location is shut down.

[14] Gardner, who had never broken character in seven seasons on SNL, cracked while playing NewsNation host Bobbi Moore in a Beavis and Butt-Head-centered sketch on April 13, 2024.