Police said staff members and duty managers at both premises had been spoken to after the sales, but it was yet to be determined what action would be taken.
The duty managers and licensees could be referred to the Liquor Licensing Authority, while the staff who sold the alcohol could face prosecution.
Palmerston North police alcohol harm reduction officer Sergeant Glenn Ryan said it was disappointing some premises were continuing to breach the most basic of provisions of the liquor laws.
He said bar staff and duty managers should never solely rely on security staff vetting patrons for intoxication and age.
"Whilst they are generally a good gatekeeper, the overall responsibility for ensuring compliance with the Sale of Liquor Act falls squarely on the shoulders of the duty manager."
Mr Ryan said the premises also showed a "severe deficiency" in their ability to monitor the drunkenness of their patrons.
At closing time, many patrons needed help walking, or lost their balance completely and fell over in the streets.
"It was a very disappointing way to end the night."
