Upon Martin's return, he got tearful hugs from Rhoda, Brenda, and even Benny--as well as applause from the studio audience.
Rhoda finally tears down the beads hanging in the doorway from her living room to the hallway, claiming she's had them since living in Minneapolis - but in a season 5 episode of The Mary Tyler Moore Show, Lou had moved into Rhoda's old apartment, where the beads continued to hang.
Evidence that Nancy Walker's absence from the previous season had been deeply felt: upon her entrance in the first scene, Ida receives tearful hugs from Rhoda and Brenda, as well as applause from the studio audience.
This episode features the most on-screen time Carlton the doorman ever spent - although he is a guest at Rhoda's party, we never see his face as he is wearing a gorilla mask.
When you see Rhoda arrive at Joe's apartment with her stuff, she is entering a building on Sutton Place South in Manhattan, right near the Queensboro Bridge.
We learn Ida's maiden name is Nessel.
When Mary is leaving Jonah's office after being hired, her purse switches from on to off to back on her shoulder between shots