Heinähattu is begonnen met school, waar ze veel opwindende gloednieuwe dingen leert. Vilttitossu houdt er niet van om thuis te blijven zonder een zus om mee te spelen. Als Heinähattu vertelt over een aanstaande visreis met haar klas, bedenkt Vilttitossu een ingewikkeld plan, zodat het Vilttitossu is die de reis bijwoont in plaats van Heinähattu. De reis wordt een onvergetelijk en chaotisch gebeuren.
Nee, helaas is Heinähattu, Vilttitossu ja ärhäkkä koululainen nog niet beschikbaar op Netflix in Nederland.
| Camera | Mark Stubbs | Director of Photography |
| Sound | Sami Sarhamaa | Sound Re-Recording Mixer |
| Sound | Katja Lappi | Original Music Composer |
| Sound | Miikka Huttunen | Original Music Composer |
| Writing | Sinikka Nopola | Screenplay |
| Sound | Rauno Mynttinen | Boom Operator |
| Editing | Pasi Mäkelä | Colorist |
| Camera | Riku Virta | First Assistant Camera |
| Camera | Veli-Matti Olkinuora | Key Grip |
| Writing | Sinikka Nopola | Book |
| Directing | Melissa Markki | First Assistant Director |
| Writing | Tiina Nopola | Screenplay |
| Camera | Valpuri Lindberg | Second Assistant Camera |
| Writing | Tiina Nopola | Book |
| Sound | Olli Huhtanen | Sound Editor |
| Lighting | Eero Rissanen | Gaffer |
| Camera | Joni Juutilainen | "B" Camera Operator |
| Directing | Noora Suviola | Third Assistant Director |
| Camera | Vilo Lassheikki | Digital Imaging Technician |
| Sound | Tuomas Järnefelt | Production Sound Mixer |
| Crew | Juha Pursiainen | Stunt Coordinator |
| Visual Effects | Sami Haartemo | VFX Supervisor |
| Editing | Kimmo Tiainen | Online Editor |
| Directing | Lenka Hellstedt | Director |
| Production | Marko Talli | Executive Producer |
| Production | Jorma Reinilä | Executive Producer |
| Production | Janne Kataja | Co-Producer |
| Production | Pia Winter | Executive Producer |
| Editing | Iikka Hesse | Editor |
| Production | Sinikka Nopola | Co-Producer |
| Production | Olli Haikka | Executive Producer |
| Production | Jarkko Hentula | Producer |
| Production | Sami Yli-Huumo | Co-Producer |
| Production | Anni Pänkäälä | Producer |
| Production | Pekka Kataja | Co-Producer |
| Production | Tiina Nopola | Co-Producer |
| Production | Arvi Komulainen | Executive Producer |
| Costume & Make-Up | Kaisa Pätilä | Makeup Designer |
| Sound | Olli Huhtanen | Sound Designer |
| Costume & Make-Up | Susse Roos | Costume Design |
| Art | Saara Joro | Production Design |
| Production | Anni Savela | Production Manager |
