This is the only episode of the TV series that Pop stars in without causing the death of any characters (he may have indirectly killed Cub when he started whistling, though Cub may have just been injured).
This is one of the few episodes where Pop is missing his pipe for the entirety of the episode.
When Pop calls Lumpy, some of the sounds he makes sound a lot like Fliqpy.
This is the first time the sun has gone down in a TV episode.
Although he does not live long enough to make use of the information, Lumpy's plan to identify Whistle by whistling actually works; of all the dogs in the van, Whistle is the only one who gets a bulging left eye. All the others have bulging right eyes.
However, this only applies for this one scene.
When Giggles giggles at Whistle, she sounds exactly like Petunia when she makes the same giggle in I Heart U.
When Giggles is being killed by Whistle, she screams the same way Cub did in Water Way to Go just before he died.
The YouTube thumbnail for Part 1 spoils one of Giggles' injuries before death.
The title of this episode is a common phrase said when you realize a mistake you made.
Whistle tearing Giggles' skin off her buttocks is a parody of the Coppertone sunscreen logo.
The moral of the episode, "Let sleeping dogs lie", means to not disturb.
Disco Bear's injury before death is similar to Russell's injury in Idol Curiosity.
When this episode aired along with Concrete Solution and Sea What I Found on YouTube, the alternate title for the conglomeration of the segments was named "The Third Degree." Lifty, Shifty, Pop, Cub, Cuddles, and Lumpy, appear in all three episodes. Lumpy and (Debatably) Cub die in all three episodes they appear in, Lifty & Shifty die twice, Cuddles (Debatably) dies once and Pop survives in all three episodes.
Whistle is based on Ken Pontac's dog of the same name, who also provides Whistle's voice.