The D.B. Cooper song from Leverage Season 5's "The D.B. Cooper Job" can be heard playing in the background of a flashback bar scene.
This is the second time Joanna Cassidy (Stella) played a character with dementia. She also played Pride's mother in several episodes of NCIS: New Orleans (2014-2021), who similarly suffered.
Guest star Joanna Cassidy played Dwayne Pride's mother on NCIS: New Orleans (2014). Leverage: Redemption is taped on the same set as that show.