Continuity: At the beginning of the movie, when Clark is driving down the street looking at the map, there are 4 kids roller blading in the street. In one shot, one of the kids jumps onto a parkway lawn to avoid being hit by Clark's bad driving. Next shot, when they pan back to the kids, all 4 are still on the street.

Continuity: In the first breakfast scene the ketchup bottle located between Clark and Rusty moves and at times vanishes between shots.

Continuity: Towards the end of the film Rusty's gold medallion and other jewelry disappear when he enters the wedding chapel.

Continuity: When Rusty Griswold first gets his fake ID, he walks in to the Riviera Casino and goes up to the bar. When he tries to order a drink, the bartender asks for ID, right when he is doing this, he lays down a napkin, and then the scene switches and he lays the same napkin down in the same place again.

Factual error: The club where Vicky works is advertised as being located on the strip but is actually on Paradise Rd. across from Hard Rock.

Continuity: While the Griswolds are playing keno at the end of the movie, there are a few mistakes with the game. When the keno lady is calling out the numbers, she calls out 14 as the 3rd number and 33 as the 5th number. When they show the keno balls up close it says the 3rd number is 48 and 52 as the 5th. Also in one scene it shows 30 already on the board, but a few shots later 30 hasn't come up yet.

Continuity: At the beginning of the movie when Clark is entering his house and the camera angle is from inside, just as he opens the door there is something red on his front porch. If you look at any of the previous scenes, that red thing isn't there. It's the bottom of a sunscreen being used to block the bright sunlight (which would have flooded the camera) behind Clark as he enters the house.

Continuity: When Eddie and Clark are at the buffet, the cook has the two pots of chicken and beef, but the signs are in the wrong place. So he picks up the chicken and places it in the spot where it is supposed to go. He is about to put down the beef sign where it's supposed to go, and you see him pick up the chicken sign AGAIN and place it in the right spot, as well as the other sign.

Other: Most evident in the massage scene, Jilly's gold ID bracelet on his left wrist is inscribed with the name "Jerry". Jilly is played by Jerry Weintraub.

Continuity: Towards the end of the movie when Clark Crashes into Wayne Newton's house you can see the hood of the tour van is not damaged. A few scenes later when they pull up to the casino the hood has a lot more damage to it.

Continuity: Clark gives the blackjack dealer $200 and asks for chips. Even though the dealer never give him any chips,in the next shot we see he has chips in front of him and he's already placed one in the bet area. In the next shot the dealer asks him to place his bet and we see that the amount of $5 and $25 chips in his stack far exceeds $200.

Audio problem: When the whole family is at the Siegfried and Roy show Clark is asked to participate and they make him disappear and he doesn?t come back. At one point Rusty says "I wonder where Dad went" and Ellen responds with "I don't have a clue". If you read Ellen?s lips she is actually saying "I don?t know" and waves her hands.

Deliberate "mistake": After checking-in at the Mirage, Clark is sitting by his hotel room window admiring the northward view of the strip. Based on the view he must actually be sitting at the nearby Treasure Island hotel.

Continuity: When the guy takes the picture of Rusty, he's smiling a lot, but when you see it later in the movie, you see that he looks sort of confused in it, not smiling.

Continuity: When Clark and Eddie go to the casino to get all Clark's money back, they walk up to the table and there is already a folded twenty dollar bill there. Then it shows Clark puting twenty down the same way.

Continuity: When Rusty takes his fake ID photo, he places his right hand directly over some numbers on the bottom of the "license." In the next shot, his hand has moved over significantly.

Continuity: When Clark is checking in at the hotel, he puts down his credit card twice.

Continuity: In the scene after Clark cashes a check to go to the card table Eddie orders a blue drink in a large glass. In the next shot when they walk away from the table Eddie's drink magically turns green. Then in the scene where they meet Wayne Newton, Eddie's drink is blue again.

Continuity: When Russ takes his fake ID picture on the street, and he sticks his head in the giant license and there is no backdrop behind his head...you see Vegas light behind him.. but when the casino guy checks the fake ID, it is all white behind his head... no Vegas lights.

Continuity: When the mom is with Wayne Newton, after she was covered with pasta, she has a noodle in her hair. Later we see it dangling in front of her face to look more messy.