Out at the pool at the desert motel, when Sera picks up the bottle and walks over to sit on Ben, the alcohol in the bottle goes from about half full as Sera is sitting, to three quarters full as she sits and drinks. Also, the label on the bottle is facing away as she starts to sit, yet is facing the viewer as she completes her sit. As she sits with her hands apart, arms spread wide, holding the bottle in one hand, it would be quite difficult for her to spin the bottle 180 degrees in the second or two it takes her so sit.
When Sera is performing oral sex on Ben in his motel room after he first meets her; you can clearly see her back visible with no scars on it. There's another scene with the two of them in bed after Ben's drunken rage at the casino - where he slides up her top to see the scar on her back (Which is not possible to be there at this spot).
Ben flips out and overturns a blackjack table in a casino. The tables in casinos are fixed to the floor to minimize the risk of someone stealing chips by "accidentally" overturning the table and scattering them on the floor.
Ben solicits a prostitute who steals his wedding band. Several scenes later when he is being fired, he is wearing it again. However, the opening scenes of the movie are not in chronological order. In the same scene where you see the ring again, you also see him receiving the severance check that he cashed at the bank in the previous scene.
When driving through Las Vegas, Ben finishes a bottle of Vodka, two minutes later there is liquid in the bottle again. Since he is severely alcoholic, it can be expected though that it's not necessarily the same bottle, he may also have opened a second one.
The checks (casino chips) in play on the dice game in particular are unlabeled. Those are hard plastic play at home chips. Every joint has the name and denomination of their checks on a round label in the middle of their, usually, clay checks or sometimes a hard, slippery composite check with a metal insert about the size of a dime. The checks are labeled for obvious security reasons.