Porky is being disturbed by mice, which is causing him to lose sleep. He hires a cat in order to get rid of the mice, but things don't go as well as he planned - as the cat gets drunk and disturb his sleep.
This is the second appearance of Hubie and Bertie, and their first appearance in the Looney Tunes series. In this cartoon, however, they are depicted as unnamed generic mice, indistinguishable except for fur color. None of them talk in this cartoon, except for one line said by one of them in one scene; "I'm only 3-and-a-1/2 years old". They only appear in the first half of this cartoon.
This is the only cartoon Hubie and Bertie paired with Porky Pig. This is also the only cartoon where Claude Cat is Porky's pet cat, and the only cartoon where all four aforementioned characters are paired together.
Unusually in this cartoon, Claude Cat is depicted as a smart and resourceful feline as opposed to the dimwitted and neurotic feline he was in other appearances, and both Hubie and Bertie lose to Claude Cat.
The Rube Goldberg-esque contraption would be seen again in the 1947 Sylvester and Tweety cartoon Tweetie Pie, where Sylvester uses it to catch Tweety, except that the bait used in bird seed instead of cheese, and unlike the contraption depicted in this cartoon which is successful, the contraption seen in Tweetie Pie fails as it injures Sylvester instead (coincidently both Trap Happy Porky and Tweetie Pie were written by Tedd Pierce).
The mouse that robs the trap Porky sets out quotes Baby Snooks' line, "I'm only three and a half years old". However, as house mice are adults at an age of fifty days and have a short lifespan of two to three years, a three and a half year old mouse would be a geriatric case.
The opening shot, of the sign stating "Uncle Tom's Cabins: Boarders Taken (For All They've Got!)", is cut on Cartoon Network, Boomerang and The WB!, although it has aired uncut on Cartoon Network and Boomerang channels outside of the United States (and at least one showing of this short on Cartoon Network's Looney Tunes compilation show in the United States has aired this cartoon with the "Uncle Tom's Cabins: Boarders Taken For All They've Got" establishing shot intact in 2009, though it is unknown whether this was a mistake or intentional).
The version on the former WB network also edits the part where the cats drunkenly sing "Moonlight Bay" to remove all of them pausing in the middle of the song to down some more cider.