Corrected entry: When the police officer is arresting the shoplifter at the beginning of the episode, he does not read him his Miranda rights. (00:04:20)
Correction: Officers don't have to read a suspect's Miranda rights at the moment they say "you're under arrest." A suspect's rights only need to be read before questioning. However, the only consequence of rights not being read is that what the suspect says after being arrested can't be used as evidence in court.
Correction: It's a common myth (propagated by TV shows) that you have to be read your rights while being arrested. This is not true, and in many cases would not be convenient. It could actually put a police officer's life in danger to pause mid-arrest to read out your rights. You simply have to have your rights explained to you prior to being interrogated, because that is the point at which the right to remain silent and to have a lawyer present actually matters.