When Max is running from the guards, the Tryptophan bottle is obviously empty. If it had had pills in it they would have been rattling around, yet no noise from the pills is heard.
After Max throws the shoplifter's buddy out of his car, as she zips away in it, a boom mic and a small stage light are reflected in the rear window very briefly.
When Break (Abraham Benrubi) sings "La donna e mobile", he sings one line of the lyrics wrong - he repeats "Qual piuma al vento" (Like a feather in the wind) as line 5, instead of "Leggiadro viso" (A beautiful face).