In Episode 400, Joan states she has been working in the service for 10 years. In later episodes she says 20 years and then 25.
Seen from the opening credits of episode 553 onwards, Lexie Patterson's mugshot in no way resembles how she looked on arriving at WDC in episode 509 (when the photograph would have been taken).
During the entire run of the series the officers constantly remind anyone entering or exiting prison to sign the book including when a prisoner leaves at end of sentence or out on day release but they never sign them in upon arrival at start of sentence but they do at end of any day release. Its also noted that on occasions when prison is evacuated that no officer is seen using said book to check everyone is out.
When Bea Smith is written out of the series, she is transferred from Wentworth to a lower security prison, Barnhurst. Already twice convicted of murder, Bea was facing a third murder charge at the time of her transfer, and had already made three escape attempts (two successful). If anything, Bea would have been transferred to a maximum security prison.
In many scenes where someone has been injured/stabbed the person can be seen pulling the object out this includes one scene where in a riot a pair of scissors is pulled out of a wound, you do not do this as the scissors are the only thing thing stopping blood from pouring out.
During some scenes where a prisoner is speaking with a legal representative an officer is present, this is fixed in the later seasons as a prisoner has the right to see their lawyer alone.
The role of Deputy Governor in the series does not specify what duties the deputy has and is seen to be a highly sought after position and officers are often seen complaining about rosters. The deputy governor oversees court transfers, budget, cell searches and staffing rosters, as well as reporting to the governor the days events and meetings with other officers and staff. The Deputy Governors of Prisoner oversee staffing rosters and transfers but not much else.
Throughout the series, the walls and gates wobble when there is alot of movement.
In scenes with weapons (such as guns) its possible to see the barrel has been covered up signifying the weapon is a prop.
During the credits some episodes, actors names have been misspelled.
During one episode Fletcher says "Good night" to Vera and Meg, but outside it is clearly morning.
Once the Wentworth staff adopt khaki uniforms, the female officers have the option of wearing skirts or trousers. Invariably a skirt-wearer, Joan's arrival for work in trousers always signifies that she will be taking part in an action sequence.
When she first enters the series Governor Ann Reynolds makes several references to her daughter Julie. The character eventually appears in episode 540 but has been renamed Phillippa, shortened to Pippa. This was presumably to avoid the fact that by this point there was already a Julie (Egbert) in the current cast. It is, however, worth noting that Pippa would be entirely likely to rename herself, in keeping with her somewhat flighty persona.
The show's opening credits featured mugshots of prominent characters, which would have been taken when they were first taken to prison. After Lynn Warner was written out of the show, her mugshot was replaced by that of Lizzie Birdsworth. However, at that point Lizzie had been in prison for over 20 years, meaning she should look much younger in her mugshot.
Bea Smith's husbands name changed varies from Harry to Jack.
The named background characters names vary.
In one episode Joan says she will drive with an officer to court, in another episode Joan says she doesn't drive.