Goof: During the narration about The Saint Valentine's Day Massacre, seven hit-men with machine-guns are shown. At the actual event, only two machine-guns were used.
Goof: Rossman is mistakenly referred to as Rossi by the narrator in the scene where the Untouchables enter Francie's apartment searching for Dan Madikoff.
At the end of the episode, the fight scene between Smiley and Ray Quist uses some stunt doubles that don't look much like them.
Trivia: Because blanks can be dangerous, actor Don Gordon fires his gun to miss actor Harry Swoger, around his right knee,even though Harry grabs his chest.
Evidently, Patricia Neal couldn't sing a lick because Maggie Storm never warbles a note in this episode even though she's supposed to be a well-known nightclub singer. She appears on-stage and she spouts a few one-liners but Neal/Storm never sings.
End Credits: Beverly Powers is listed by her alternate name Beverly Hills.
There really was a death tree as depicted in this episode only it was located in Little Italy not Chicago's gypsy neighborhood. The blood-stained Genna brothers used to post the names of their intended victims on this tree.
Continuity: Even though the Blue Lion club is seen getting shot up on the inside, when the scene switches to the ouside, stock footage of the Club Mademoiselle is seen from The Rusty Heller Story episode.
Goof: Robert Bice, who played Capt. Jim Johnson in this episode, and a total of 17 times in this series, is listed as Capt. Dorset in the end credits.
The name of the murdered Federal agent is given as Arnold Wainwright in the narration but in the newspaper article being read by one of Nitti's boys his name is given as Arnold Weyrig.
Walter Winchell, in his narration, mistakenly refers to Georgiana Drake as "Georgiana Blake."
Walter Trager made a foolish decision to shoot it out with the Untouchables because he probably could have beaten the rap for killing Cully Grice. That one was clearly a case of either self-defense or justifiable homicide since Grice was attaching his silencer to his pistol in order to shoot Trager at the time he was shot.
Recycled: the filmclip stolen from episode # 16, The St. Louis Story, shows Bernard Fein (as Tim Harrington) getting chased down and shot on the run. He endured the same nightmare situation twice.
When Coombs fires twice at Halas, the first shot is clearly wide yet Halas grabs his abdomen area as if the bullet hit him.
Real-life boxer Max Baer didn't "win a decision" over any boxer during the time period shown in this episode.
Agent Rossman was not riding in the car with the rest of the Untouchables as they made their way to the showdown at the hotel. Yet, when the shooting starts, Rossman comes charging in with a shotgun along with the others.
Actor John Duke is seen using his right hand to reach for his gun when his character is named "Lefty" Southern, implying that he is left-handed.
For the scheme of printing one million bogus one-hundred dollar bills with the same serial number to work, they would have all had to be spent in a coordinated manner, at the same time across the country. Once one of the bills was spotted and reported as counterfeit, an alert would have gone out to all banks and the other bills would not be accepted anywhere.
When Dreiser is seen making a daring prison break, the stunt double can be seen standing up after supposedly falling from the rope that the viewer is made to believe is well short of the ground.
Lily's "Fleur-de-Lis" beauty shop, which is in Chicago, can be seen right next door to "Whalen's Ham 'n' Eggs", which is in Kansas City as seen in episode #44, The Jamaica Ginger Story.