The logo from Bruno's and Gonçalo's t-shirt usually changes during the episodes.
One of the main plots of 'Odisseia' is the fact that the show was supposed to have 13 episodes but then cut to 8 due to lack of budget and audiences. Although that cut may seem true, the creators of the show confirmed that it was always part of the plan to have 8 episodes and the 'cancellation of the show' plot was merely for comedic/narrative reasons.