When Mr. Stanley is scolding Angela about the jelly touching other doughnuts, there is a doughnut in the case with a bite taken out of it.
In the beginning of the episode after the witness (Dante) is taken back to the hotel, Vince refers to the prosecutor as Valerie Delgado (the same surname as the role Sanchez played in "without a trace", yet her character is listed as Valerie Hudson in IMDB
During the courtroom scene, the defense attorney refers to the murder weapon as "fruit of the poisonous tree." This is a metaphor used in the legal profession to describe evidence obtained illegally or as the result of a warrant obtained due to illegal evidence or testimony.
Many of the episode titles are also the names of songs; "Can I Get a Witness" is by Marvin Gaye.
In Relita Washington's MA Drivers License registry information file, her apartment number is listed as "Apt. 22" which matches the numerals on her apartment door the first time Detectives Rizzoli and Frost visit to question her about Dante's murder. The second time Rizzoli and Frost visit her, Relita's apartment door now sports the numerals "23."