The only main twist of the series was the prize money - which was raised from $250,000 to $1,000,000, but this was kept hidden from housemates until later in the season.

[2] The two Intruders were some of the least liked in all the four seasons, with Violeta being chosen for eviction by every single housemate, and then Monica, who already had a boyfriend outside, immediately started falling for Ryan, and she and Bree developed rivalry towards each other.

The diary room chair is orange instead of red, and the evicted housemate in the titles was changed to blue.

Gretel Killeen hosts the much anticipated live show where the introduction of the 2 intruders has arrived, how will the house react to their new playmates?

Gretel Killeen hosts a live show where the 2 intruders are facing the boot and whose journey will end - the housemates will decide but who will go: Monica or Violeta?

The letter E had fallen off and it was intended to read "Free The Refugees" in reference to Australian Government policy of mandatory detention of asylum seekers.

[2] The producers were criticised for making a deal with housemate Ryan Fitzgerald who was permitted to wear a T-shirt that was branded with "MLS" (acronym for Massive Loser Squad).

The T-shirts were being sold while the show was running and Ryan's friends admitted that a proportion of the profits was going towards votes to keep him in the house, thus giving him what was perceived to be an unfair advantage.

Ryan has instead insisted on his radio program that his friends were not using the money to buy votes and instead spending it on alcohol.

[4] Housemate Bree Amer was incorrectly evicted instead of Wesley due to a vote counting error.