Robert Blake incessantly tails and/or waits around outside the home of a mobster (played by Godfather actor John Marley), and his henchman played by Roy Jensen, the way his character in the previous year's cop film BUSTING determinedly stuck to antagonist Allen Garfield and his muscle Sid Haig.
In an example of breaking the 4th wall, Baretta ls actually listening to the show's theme song, "Keep Your Eyes On The Sparrow", in his car. This version, though, unlike the instrumental version during Season One, includes vocals (though not sung by Sammy Davis Jr. like in Seasons 2 to 4). Also, Baretta either sings along to the song or sings the lyrics by himself.
The first time where series regular Tom Ewell joins in on a case, "on the field," helping Baretta with a stakeout from a parked car.
John Marley famously played the studio head in The Godfather that Robert Duvall eats dinner with, and he shares about how he lost his lead actress to a womanizer (Johnny Fontaine). In this episode, Marley plays a mobster who invites Baretta to dinner, and he opens up about losing his daughter to a womanizer.