A nice little addition to the movie, done with the chibi style most people have seen in Isekai Quartet. Of course, the 4th wall is non-existent here and Tanya more than once talks to the audience, along with other members. They explain the rules as part of military conduct, which actually makes sense both IRL and in the anime world. It reminded me slightly of those WW2 posters "Adolf is listening" etc. The "movie" also gives us a small look into what Japanese theatre rules so that's nice. I wish more movie releases did this kind of thing as it's quite fun to see.