Continuity: When the Dude's driving home from the doctor's, he passes a yellow truck, visible through the side window, when he throws his joint against the door window. If you compare the shot where he grabs for his joint and the next one where he sprinkles the beer, you'll see he passes the truck twice.

Plot hole: In the scene near the beginning it shows a big guy converting a 7-10 split and celebrating. If you watch it closely you will realize that the 7 pin is lined up too far to the left and the ball is already in the gutter when it hits the pin. If this guy is that good to convert the split, then he should realize that it wouldn't count anyway because the ball is already in the gutter.

Continuity: When Lebowski is driving home from the doctors office, the back window of his car is so covered with dirt that you cannot see out of it, yet when he looks in his rearview mirror there is a very clear reflection of the car following him.

Other: As "Brother Seamus" slams the door of his Volkswagen shut before "fighting" The Dude, the volume of the radio drops, although he had the window rolled down and did not have time to roll it up before getting out of the car.

Continuity: When The Dude crashes the car into the pole, you cannot see Walter lying in the road.

Deliberate "mistake": Near the beginning of the movie, the Dude is shopping at Ralph's. He is writing a check, and dates it September 11th, 1991. At the same time he looks up to see a TV with President Bush saying "This aggression (against Kuwait) will not stand." The incident against Kuwait started in the summer/fall of 1990, not 1991. The Stranger (Sam Elliot) and Walter also mention the Gulf War in the present tense.

Continuity: When Donny bowls the last time, the time when he only hits nine, just as he bowls a man with a blue bag walks behind him, then it cuts to the skittles and then back to him, and the man keeps walking from where we last saw him as if he paused for the few seconds while the skittles were showing.

Factual error: When the kidnappers hang up on the Dude before the money drop, you hear a dial tone. Cell phones don't have dial tones.

Continuity: When Dude is talking to the stranger at the bar the straw in his glass changes sides of the glass very often, but Dude isn't drinking in this scene.

Continuity: In the scene in the limo, with the Dude drinking his white Russian, some shots show him with a milk moustache, then the shot changes, and then when it returns he doesn't have a moustache. The next time the camera left the dude and returned, he has the moustache back.