Tom Brady not being able to find his jersey during the jersey swap scene is a reference to Brady's jersey actually being stolen after Super Bowl LI. That jersey, along with another one lost after Super Bowl XLIX, was found during a raid by Mexico's federal police and the FBI at the home of La Prensa (Hondurian newspaper) director Mauricio Ortega on March 12, 2017. Ortega resigned two days later for "personal reasons."
As of this movie's release, the four female leads have twelve Oscar nominations and five wins among them, all of them having been nominated. Lily Tomlin is the only one who has not won. They only competed against each other once when Sally Field and Jane Fonda were in the running for Best Actress of 1979 for Norma Rae (1979) and The China Syndrome (1979), respectively; Field won the award that time.
The movie was produced by "199 Productions", Tom Brady's company, named for the spot he was selected in the 2000 NFL draft.
Jane Fonda and Lily Tomlin are good friends. Aside from both starring in 9 to 5 (1980), they also starred in the Netflix show Grace and Frankie (2015) for its entire seven-season run.