Ratafak Plachta being played by two people means that if one was injured, another could easily fill in the role
Somárik Peťko looks like Eeyore from Winnie the Pooh, had Winnie gone through nuclear mutation. This could very likely be a reference to Chernobyl. In Real Life, animals were horrifically affected by the incident. Not only that, Slniecko was created during the Soviet era, the same era as the incident occurring.