The eyecatch illustration from episode 1 appears in the Happy Lesson OVA.
Some Panous-Panous, along with Pink à la Mode and Black Beaujolais, appear in the opening fight of another French indie production, DAMNED Next.
The whole team (minus Yellow) appears in the opening of another French indie production, Bitoman, where they are dismissed by the local villain because "[their] costumes aren't trendy enough" (they were in civil clothes).
Catherine/Pink à la Mode. The original actress left during the production of episode 3. This unfortunately happened before they could record the ADR so there is a jarring difference between her out-of-suit and in-suit lines. Starting episode 4, Catherine was played by a new actress who looked nothing like her... complete with a new costume.
Because of the stretch of time between episodes, there have been a few other minor cast change-ups. Most notable, Margarine, the team's Robot Girl.