He said there were also reports of "people deciding level 3 was like level zero", but largely Northlanders were well-behaved.
Bloomfield said with the country being at alert level 3 for close to a week, everyone should be familiar with the rules, both around increased retail activity and social interactions.
"It's been concerning to see some behaviours continue into the weekend and ultimately, this could slow a move to level 2.
"Continuing to be vigilant will be key in supporting a move down to level 2 as soon as possible," he said.
A statement released yesterday confirmed the two new cases of Covid-19 were linked to the St Margaret's Hospital and Rest Home cluster in Auckland, and both cases were household contacts of an employee at the rest home.
Of Northland's 28 cases, 24 have recovered. All eight confirmed or probable cases among Māori have now recovered.
There was no update on testing numbers in Northland but, from today, Northland District Health Board will be offering Covid-19 swabs to anyone who wants one – symptomatic or not – to seek out undetected cases.
Nationally, the total number of confirmed and probable cases of Covid-19 is 1487. A total of 1266 people, or 85per cent, have now recovered.
There were no additional deaths reported yesterday. Eight people remained in hospital, with none in ICU.
Meanwhile, there were 4634 tests completed on Saturday, bringing the total number of tests completed to 150,223.
There are still 16 significant clusters – three of these are now considered closed as there is no longer transmission of the virus associated with them.