This slip up is in the scene where Chev is at the hospital trying to get epinephrine from the man pushing the hospital cart. After Chev gets "juiced" he flies back into the elevator as the cops are coming around the corner. Now here is the slip up, After he yells at the cops to get back he unloads one round and you can see clearly that the gun is empty with it cocked back. If you pause it and frame by frame it to when he gets up to point it out the elevator, you can see it is no longer empty. There is no way he could have re-loaded for 2 reasons. 1.He wouldnt have had enough time to reload and jump up, just simply put no one is that fast. And 2.He had stolen the gun from ricky's Brother and there is no scene of him taking any clips with him as well.