When Fred first comes downstairs at the show's opening, his favorite chair is lying on its side. Later, when he and Lamont go to the living room from the kitchen, the chair is upright without anyone having righted it.
Fred is trying to sell the house to two potential buyers by quickly showing them the house before the next earthquake starts. At one point he and the couple go upstairs (and off-camera) and we hear Fred moving up and down the hall opening and closing doors to each room very quickly. However you can see his shadow on the wall as Redd Foxx is obviously standing still opening and closing a prop door just out of view of the audience.
Soon after arriving in Las Vegas, a live street crowd surrounds Fred, obviously recognizing him as Redd Foxx. One woman runs into the middle of the street, pulls out a camera and takes a snapshot of Foxx.
Right after Fred arrives in Las Vegas, he walks out of a glass building. The entire crew including the camera, is reflected in the doors.
When Redd Foxx is walking through the live street crowd that recognizes him, the wind knocks his hat off. A TV-camera man is seen openly standing in the road, in front of him. The next shot is the angle of that cameraman, filming Foxx putting his hat back on.
Fred supposedly took all the money in the house with him to Vegas, leaving nothing for Lamont to wire to Fred to buy his bus fare home. However, Lamont had just rushed in to answer the phone from taking a girl out to dinner, which you need money in order to do.