The silent comedy The Engagement of a Student in the Oak Tree (1920) is the first film by producer-director-screenwriter Erkki Karu. It has survived in parts, but there is no more detailed information about its plot. The film was filmed in Tampere and Teisko in the summer of 1919, as was its parallel work Sotagulashi Kaiun järitty kesäloma (1920).

Väinö Lehmus
as Student Pöllövaara

Elli Karu
as The Betrothed Bride

Martti Tuukka
as Engagement Judge

Elsa Aarni
as The Judge's Wife

Erkki Karu
as Butler