Continuity mistake: 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 mistake: 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.
Visible crew/equipment: 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.
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.
Continuity mistake: 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.
Continuity mistake: 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.
Deliberate mistake: In the final scene when the four cars are driving away there is a road sign that shows how many miles it is to Chicago (where the main characters are from). In reality there would not be such a sign because there is not one direct route from Vegas to Chicago. A typical road sign would show the nearest cities.
Continuity mistake: 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 mistake: At the beginning of the movie when Clark is driving home, he skids into his driveway where it is visible that the Ford Expedition is crooked and about three feet from the bike. In the next scene the Expedition is straight and right next to the bike, so that he steps on it when he gets out.
Continuity mistake: At the beginning of the movie when Clark and his family sit down at the kitchen table to talk about their Vegas Vacation, watch the fruit basket in the middle of the table. It's there when they go to sit down and it's gone in the next scene. Every time it shows the kids it's there and every time it shows Clark and Ellen it's gone.
Continuity mistake: At the beginning of the movie after Clark trips on the bike, you can see Clark put the Vegas brochure in his jacket pocket. When he goes to open the front door you can see no brochure in his left hand. In the next scene when he enters the house the brochure is back in his left hand along with his briefcase.
Continuity mistake: Eddie (Quaid) takes Clark (Chase) to the casino buffet for dinner. As they fill their dish with food, Clark tells the server behind the buffet table that the chicken and beef dishes are labelled incorrectly. The server then switches the tags, placing them in each dish. In the next scene he repeats the switch.
Continuity mistake: At Hoover Dam, Clark pulls out a small rock and causes a little leak. While he's fixing, it another develops. He puts his left side against the second leak to hold it until he gets the gum in the hole. The water stain on his shirt changes from his left side to his right side, then eventually his entire shirt, in different shots.
Continuity mistake: In the Keno scene, after Ellen fills out the Keno card, she gets up and walks to a counter to turn in the card. While that is happening, Clark has a conversation with Mr. Ellis. During close-ups of Clark during the conversation, Ellen's shoulder and the shiny sequined dress she is wearing can be seen next to Clark. Ellen is there one moment, gone the next, back again and then Ellen is shown returning from the counter to her seat.
Add timeProfessor Zed
Continuity mistake: In the Hoover Dam scene, the tour group is walking through an underground tunnel when Clark messes with the wall and more water than normal starts coming out. He gets gum from Audrey and starts plugging the holes. He puts gum on the first hole and when the gum makes a bubble filling with water, he puts another chewed piece on the bubble. In the next shot, there is no piece on the bubble and he puts a chewed piece on another hole in the wall.