After Dominique the hooker kisses Cliff, the sign around his neck is smudged, but in the next shot, it isn't.
After Styles tricks Booker out of the closet he removes the handle. But after he awakes from being knocked out, a chair is wedged under the now re-attached handle, locking Styles in the closet.
When Dominique the hooker is in Tony's room, she tries to grab the bag with the money and stumbles. She falls down with her blouse unbuttoned, but stands up in next take with her blouse buttoned up.
When Foosball and Styles are talking after Booker goes to call Rachel, Foosball is smoking a cigarette. In one shot his hand is by his side, while in the next, his hand is by his face as he puffs the cigarette.
When Claire opens up Adrienne's letter in Tony's room, she uses both hands. In the very next shot, a close-up of the letter, she's holding in only in her right hand.
In the very beginning of the movie, when Newmar is riding his unicycle, (as it's cutting back and forth between him and the people being photographed) you can clearly see the shadow of the camera and several crew members following him.