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When a mother goes to work in a factory (like Rosie the Riveter), Porky Pig is hired to baby-sit. He quickly finds out that the baby is a violent-tempered infant. He tries to use a child psychology book to control the baby, to no avail. Eventually, the mother returns and uses the book to discipline the baby — by spanking.
DVD - TCM Spotlight: The Errol Flynn Adventures, USA dubbed version
When this cartoon aired on Cartoon Network, Boomerang and TNT in the USA, the scene in which Baby Percy impersonates Winston Churchill by saying "Of course you realize this means war" after he crashes into the kitchen was cut, but Turner networks outside the USA left this scene intact.
References to then-current events
Porky finds Butch, called "Percy" by his mother, reading "Exquire Junior", a send-up on Esquire, which was considered quite racy then. The magazine pages shows infant girls (wearing only diapers) in sexualized poses.
After Butch emerges from a pile of pots and pans with a pot on his head, he launches into a Winston Churchill (see "Censorship" above) impression, stating "We will fight until Hitler and his Nazi gangsters suffer disastrous, overwhelming and complete defeat!" While delivering his Churchill speech, Butch gives the V sign with his fingers while holding a cigar in the V sign.
The mother works at "Blockheed", a parody of Lockheed.
When the mother first meets Porky, she asks if he wants her to help defeat the Axis Powers. In the question, she uses the word "Japs", a derogatory term for Japanese people used commonly during World War II. In his response, Porky mentions "Schickelgruber", referring to Adolf Hitler's original surname.
Porky wears pants in this cartoon, something he would never wear most of his other cartoons. Running gags throughout the 2011 spin-off series The Looney Tunes Show would have people ask Porky if he wasn't wearing pants.
It is most likely that this is first cartoon to have Porky's face without Daffy on the opening bullet-titles. "Swooner Crooner" may have been the first, since it was reissued, it is now unknown.
"Brother Brat" is the last Porky Pig cartoon directed by Frank Tashlin because he left the studio to direct live-action movies in 1945.