Batman

During the press conference, Robin is standing just behind Batman in the long shots. In the medium shots, he is standing in front of Batman, although only visible from the chest up.

When Bruce and Dick slide down the Batpoles at the beginning, for the first and only time in the series, the signs saying "Batman" and "Robin" are missing.

In this episode, Mayor Linseed's wife is named Linda yet her name is Millie in Nora Clavicle and the Ladies' Crime Club.

Notice that Mr. Freeze is now wearing a freeze collar instead of a helmet and has just a freeze gun. In Mr. Freeze's first appearances "Instant Freeze" & "Rats Like Cheese", his gun could also shoot heat/flame beams.

Batman says he isn't sure that the goons that attacked the convention hall are working with Penguin, and wonders how Penguin defeated them. However, the goons are wearing the same black shirts with GOON printed on them that the Grand Order of Occidental Nighthawks wore in the previous episode when they lured Batman into a trap, and then met with Penguin.

At the end of the episode, Batman receives two phone calls in Commissioner Gordon's office. The first call offers Batman the 1968 presidential nomination for one of the two major political parties in the United States. Batman declines. The second call also offers the 1968 presidential nomination to Batman who responds that he thought that this party already had a candidate. Two years before the election, the show correctly predicted that President Johnson would not run for re-election in 1968.

The sign outside the farm says "Old MacDonald's", but all the boxes of eggs say "Old McDonald's"

Egghead has figured out that Bruce Wayne is Batman. Oddly enough, he doesn't say a single word about Dick Grayson being Robin!

After The Caped Crusaders knock over the hourglass, the speaker attached to the inside of the hourglass disappears in the close-up shots, although it's clearly visible behind them in the previous long shot. It then reappears again when they start running.

This is the first second season episode to explain that Harriet Cooper is Dick Grayson's aunt with no blood relation to Bruce Wayne.

When Ma gets into the cab of the truck, she says in a normal voice she has a slight headache. A few minutes later, Batman says he overheard the comment. At the time Ma said it, Batman was far enough away that he had to run for 10 seconds to get to where the truck was parked. He couldn't have heard her from that distance over the sound of the truck's engine.

When Ma hijacks the truck outside of the theater, she has the truck driver stay in the cab, while she orders her two boys into the back. One trips and is left behind. As the truck drives away, the driver has disappeared and her remaining boy is driving.

As the police open fire when Ma Barker shoots at them, the paper wads from the blanks they're using drift down and are clearly visible against the black hoods of the police cars.

Ma Parker and her felonious family are loosely based on the real gangstress Kate "Ma" Barker and her sons Herman, Lloyd, Arthur and Fred. They teamed up with Alvin Karpis and several other criminals forming The Barker-Karpis Gang which rampaged across the Midwest from 1931 to 1935. While the Parker family characters are based on "Ma" Barker's sons, the names of those sons come from a variety of sources. The Mad Dog Parker name is lifted from the 1941 movie classic High Sierra starring Humphrey Bogart who played the desperate gangster Roy "Mad Dog" Earle. Machine Gun Parker's moniker comes from Machine Gun Kelly , a notorious criminal during the Prohibition Era who spent 17 years on Alcatraz Island into his old age where he became known as "Pop Gun Kelly." Pretty Boy Parker comes from Charles Arthur "Pretty Boy" Floyd, a notorious American bank robber who was gunned in East Livermore, Ohio by local law enforcers and FBI agents led by Melvin Purvis on October 22, 1934.

When the Tutlings steal the Sphinx, they say there's only one light on in the house. However, there are two lights on in the house behind them.

The Minstrel's female assistant is named Amanda in the credits but in the actual show her name is Octavia.

When the scrubwoman hands her mop to Robin, the fixture on the wall is behind and to the left of The Dynamic Duo, and they're standing at an angle to the wall. In the next shot, the fixture is immediately behind them and they are standing perpendicular to the side walls.

When Batman describes all the "artful adversaries" they've faced, he mentions Clock King. Clock King won't appear for his first appearance until "The Clock King's Crazy Crimes."

The narrator calls the latest dance craze: The Catwalk, but in "Hot Off the Griddle", Aunt Harriet called it the Catoosie.

Goof: When Catwoman pours the eggs into the hotfoot chamber, the right glove is shorter and cuts off just short of a gray tunic. In the long shots, Catwoman is wearing her normal longer gloves that blend into her black costume.