Goofs

When Beavis is delivering his "We're never gonna score" speech on the bus, the old woman's skin is much darker than in other scenes.

When the duo are on the plane to Las Vegas, the people sitting in the row immediately behind them changes - most easily seen as the man sitting on the aisle seat changing from a man in a vest (who later asks if there is corn in the dinner from another row on the opposite side of the plane) to a man in a business suit

When Beavis and Butt-Head dance while "Love Rollercoaster" plays, the floor changes from carpet to tile, and back to carpet again.

Anderson's truck and camper are washed away from the water released by the Hoover dam, yet they still make it to D.C.

Tom Anderson is involved in the large multi-vehicle collision caused by Beavis and Butthead falling out of the trunk of Dusty's car on the highway near Washington, DC, and does significant damage to the front end of his SUV. In later scenes at the White House, however (supposedly later the same day), his vehicle is undamaged.

As the airplane takes off for Las Vegas, one of the runways is number "41". Runways are numbered by their magnetic headings, and thus the highest runway number possible is 36 (360 degrees, meaning north).

As Hoover Dam only supplies 4% of Las Vegas's power, its failure would not cause a citywide power outage.

Automatic flush urinals do not function in the way shown in the film. Simply waving a hand in front of the sensor will not flush the toilet.

The airplane is pictured with a red light on the tip of its starboard wing. This light should be green.

On the streets of Vegas, a building has the name "Freemont." This is a misspelling; there are many establishments in Vegas called Fremont, but they only have one "e" (as they are named for John C. Fremont).

During the scene that takes place in Congress, the American flag is displayed vertically with the blue field to the right; it should be displayed to the left.

After the ATF storms into Dallas Grime's hotel room, Agent Flemming introduces himself and announces that he is an ATF agent, however, when he shows his id, it clearly says FBI.

In the end credit music listings for AC/DC's "Gone Shootin'", Malcolm Young's first name is misspelled as "Malcom".

The credits claim they are "in order of appearance." Butt-Head appears before Beavis, but Beavis is listed first.

After the ATF storms into Dallas Grimes' hotel room, Agent Flemming introduces himself and announces that he is an ATF agent. However, when he shows his ID, it clearly says FBI.

When Mr. Van Driessen's classroom gets raided, Principal McVicker's hand has an extra finger as he's pointing to the teacher.

The parking area for Hoover Dam is on the Nevada (west) side of the dam, so the tour bus would not have driven across the dam before the passengers went on the tour of the dam.

There are positional inaccuracies with numerous Washington DC landmarks.

There are a number of inaccuracies with the airport when Beavis and Butt-Head land in Vegas. There is only one major airport that receives jet airliners in the city, which is McCarran International Airport. The actual airport has a number of slot/gaming machines in the terminals. Furthermore, the view from the windows is inaccurate. The airport is surrounded by office buildings to the east, large multi-story office/business plazas to the south, freeway to the west, and housing to the north.

While on the tour bus, they come across a sign for a town called Bald Knob. The only places called Bald Knob in the US are easy of the Mississippi River. Either the sign is fictional or the bus traveled in a circle.

Beavis and Butt-Head are surprised to see Anderson has a camper. When they leave the camper he asks if they are the ones whacking off in his tool shed. Later at the ATF roadblock, Anderson incorrectly tells the ATF agent the picture is of the two guys whacking off in his camper, not his tool shed.

Despite the fact that ATF Agent Flemming corrects Bork in regards to ending a sentence with a preposition, he ends up making the same error. He asks Bork if he knows what teens "are capable of".

Agent Bork ends a sentence with a preposition without being corrected by Agent Flemming. Bork's uncorrected line is "Where did these guys come from?"

A possible reason for the line to not get corrected by Agent Flemming is the fact that they aren't operating in front of civilians. Either that, or the stress from finding the X5 Unit is so great, Agent Flemming does not prioritize the correction of Bork's line in this Goof.

When Las Vegas runs out of power, ATF Agent Flemming says "What the hell is going on?". The word "on" is a preposition, and he later corrects Bork for ending his sentence with a preposition (at Highland High School).