Betsy Blake, the rehearsing actress, is portrayed by Phyllis Davis, arguably most well known as Dan Tanna's secretary, Bea, on Vega$ (1978).
R&I = Records and Identification.
After dealing with the nosy and obnoxious neighbor in the apartment building, Mrs. Genevieve Wilson. played by Maudie Prickett, Malloy says "and that old lady will probably live to be a hundred." In real life, Maudie Prickett, the actress who played the woman died 7 years later in 1976 at age 61.
The electronic sounding stock music used often in the early seasons of the show to indicate a disturbance of some sort is used here when Malloy and Reed enter Cal's Joynt where they are responding to a drunk disturbance call.