The original released description of this episode described the concert Stewie & Brian attend as Bette Midler & they were having an adventure w/ the Time Machine, both of which did not happen in the episode.
The Vegas Star Hotel has 6 floors.
Stewie & Brian have the top floor room but ...
... when they climb on the railing, they are on the fourth floor.
Brian & Stewie's POV from the railing shows a truck, a blue car, an empty space & a red car in the parking lot.
Also, along the side there's a grey car.
When Brian lands on the sidewalk, blue car has changed to a purple car & the pickup truck has changed to a green car. Along the side, the grey car has changed to a red car.
The exterior shot of the Vegas Star Hotel is different from when we see it after Brian lands on the sidewalk below.
When Brian lands, there are suddenly slanted parking spaces along the street w/ the Adult Superstore.
There is a parking lot with painted spaces under their balcony & a cross street underneath their window that wasn't there before.