In the splash screen, tutorial and some TVs, you cannot see some videos, a test pattern appears instead. That happens because of mfplat (Microsoft Platform Foundation Libraries), which is a part of wine/proton that is being heavily worked on, meaning this should be fixed soon. However, there's no impact of this issue in the gameplay: what you have to do in the tutorial is pretty obvious, and you don't miss anything relevant by not watching these short videos.