Return of the Prodigal - S5-E1
Plot hole: Mickey Bricks returns to England by stealing the uniform of a Commander Cardwell, an officer in the Royal Navy, and taking his place on board an aircraft carrier that is sailing from Australia to the UK, leaving that day, a voyage that would take three to four weeks. During that time, Cardwell does not report his uniform stolen, nor does he report to the aircraft carrier to take up his duties, and since there was a car waiting to take him to the ship he is obviously supposed to be there. Theft of a military uniform is taken extremely seriously and once reported it would take no time at all to establish that "Cardwell" appears to be on board his ship! On top of that, during his entire time at sea nobody on board calls upon Mickey to perform any sort of military duties (of which he would have absolutely no knowledge), he doesn't run into anyone who knows Cardwell, and nobody asks to see his orders, military identification or travel warrant.
Return of the Prodigal - S5-E1
Plot hole: Emma Kennedy gets into the morgue and coroner's office when she is wheeled in on a gurney sealed in a body bag. Mickey distracts the morgue attendant so she can get out of the bag and go to the coroner's filing room. All well and good, but what happens when the attendant goes back into the morgue after Mickey leaves and sees the empty body bag on the gurney? There is no indication that Emma gets back into the body bag and there is no reason for her to do so.
Return of the Prodigal - S5-E1
Factual error: There is absolutely no way prison visitors would be allowed into the cell of the prisoner they are visiting - they would not even be allowed into any part of the prison except for the visiting room. This is nothing to do with the guards going easy on Albert - they would be sacked on the spot for such a blatant and highly visible breach of prison rules.