Continuity mistake: In Rusty's last craps scene, the croupier pushes the dice to him but Rusty picks up several chips instead - not the dice. Rusty immediately rolls the dice without having picked them up.
Continuity mistake: When the Griswolds get into their hotel they meet their parents at the intersecting door Audrey is pictured by the door frame but the camera cuts off and she is sitting on the bed.
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. (00:01:39)JamesP
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.
Visible crew/equipment: The camera and the cameraman are reflected in the chrome of the Griswold limousine when they are driving down the strip.
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.Professor Zed
Visible crew/equipment: In the beginning of the movie after Clark trips over the bicycle in his driveway and approaches his house you can see the microphone in the upper middle of the screen momentarily.