http://www.elections.org.nz/rules/candidates/election-day-rules.html
Parties, party supporters or candidates may
* Wear party lapel badges (including rosettes) in public bearing the party’s name, emblem, slogan or logo (but not the candidate’s name)
* Display streamers, rosettes, ribbons and similar items in party colours on people or vehicles.
http://www.elections.org.nz/rules/candidates/appointing-scrutineers-and-special-voting-witnesses.html
Electorate candidates may appoint scrutineers to observe the conduct of the election in the following situations:
* the issue of votes during polling day and the preliminary count in polling places after 7pm,
* the early count of advance votes in the Returning Officer’s headquarters from 3pm on polling day,
* the checking of special vote declarations at the office of the Registrar of Electors,
* the scrutiny of the rolls at the Returning Officer’s headquarters,
* the official count at the Returning Officer’s headquarters, and
* any judicial recount of electorate votes.
Scrutineers need to be well briefed on their rights and obligations – in particular that they must not communicate with voters.