Marge looks up Stan on his Facebook page to see that he had no kids.
When Marge can't get the car started and Homer says, "Let Automobile von Bismarck give it a try," he is parodying the name of 19th-century German statesman Otto von Bismarck.
The motel sign "M. Night Shyamalan's FLOP HOUSE," a play on the meaning of flophouse, is a reference to that director's string of less-than-successful movies.
The igloo-shaped motel "The Nook of the North" (subtitled "An Ice Place to Visit") is a reference to the film Nanook of the North.
The opening sequence has been replaced with a variation of the short Homer Votes 2012. The changes are that instead of Ned Flanders being deposited out of the tube next to Homer, Selma Bouvier is instead. Also, Homer doesn't run and jump out of the window.
The number plate on Marge's new car is PABF18, the production code for this episode.
Across the street from the Flop House is a "Krusty's Hot Tub" sign showing Krusty sitting in a hot tub, looking through binoculars at the woman sitting across from him, who is flashing her chest at him.
The room key at the "Doghouse Motor Lodge" is on a dog collar.
The sound of the water dripping into the cavern filled with water occurs before the drop of water actually falls into the pool.
Rocks cover the holes at the bottom of the cavern when the water goes further into the ground, but when Marge's car falls in, the rocks have disappeared—the floor is flat.
The scene in which the vehicle covers up the sinkhole has an animation goof. When it marks the road, the marking in front of it has already been done, and it isn't marking the road where it should be. The animation corrects itself when the road markings are nearly done.
Richard moves from an aisle seat on the left of the school bus to a window seat on the right in about a second.
When Bart looks out of the treehouse after Milhouse has fallen off it, the view from the treehouse makes it look like the treehouse is closer to the ground than it previously was.
