The blaring jazz combo cue heard at the opening of the story at the restaurant is the same as is heard at the empty diner in the first entry in The Twilight Zone (1959), Where Is Everybody? (1959).
Perry's office is given as Suite 904 in the Brent Building.
In reference to Perry working for a client on death row, yet he never seems to lose a murder case, often times an attorney is retained to handle an appeal even though he wasn't the original trial attorney. Ineffective assistance of counsel is often times argued as the reason for a new trial.
In the opening scene in Perry's office he is dictating to Della and mentions people vs Bernard 347 us report 506 which is actual case law.