Casperls Mondfahrt is the last play written by Babette Klinger-Schmid. Karl Winkler, her successor at the head of the Münchner Marionettentheater, wrote down the dates of the performances: for this play, he notes that the sessions took place in the afternoon and in the evening, so it was probably aimed at both children and adults. The play continued to be performed after Klinger-Schmid's death, until the Münchner Marionettentheater closed in 1933.

Gretl complains about Casperl's absence, as he always comes home late and very drunk. When he finally arrives, she gets angry and wishes he would go to the Gold Star or the Silver Moon (these are the names of the taverns Casperl frequents) and never return. Her wish seems to come true when a small gold star appears to Casperl asleep and takes him against his will to the moon. At the end of an adventurous journey through different regions of the sky, Casperl is welcomed by the moon; but, exhausted, he falls asleep. When he wakes up, he is in his bed. Did his cosmic journey ever take place? No matter: Casperl resumes his tour of the taverns on behalf of the drinkers' association founded the day before and which has elected him inspector of drinking establishments.