When Lazarus is entering the pharmacy he pulls a shirt over an obviously dirty tank underwear shirt with yellow staining at the front neckline. When he talks to the pharmacist moments later he's wearing the shirt, but his still-showing underwear shirt is pristine white.
When Lazarus is singing in the bar towards the end of the film. The cable on the microphone he is using keeps switching from being wrapped around the microphone stand, to just falling straight to the floor.
Right after Rae discovers that Lazarus has chained her to the radiator, there are a series of shots from different angles. When filming Christina Ricci from behind, her shirt is down to the middle of her upper arm on both sides, but when filmed from the front, her shirt is on her shoulder on the left arm.
When Rae (Christina Ricci) wraps herself in the chain on the couch, she encircles each of her legs twice with the chain and falls asleep. When she wakes up, only her right leg has the chain around it, it's gone from her left leg.
Ronnie's American Flag patch on the right sleeve of his BDU shirt before he leaves appears to be backwards. However, this is in accordance with Army regulations that call for the flag to appear as if the wearer was advancing toward the battle; if the flag was reversed, it would appear that the colors were retreating. The unusual layout is due to the requirement to wear the flag on the right sleeve - the position of honor on the US Army uniform.