Harry and the Baron very easily conclude that the signal from Bassie's walk man is heading their way. For all they know, it could be heading towards someplace nearby, purely coincidental.
B100 often manages to find Bassie and Adriaan without any explanation given to the viewer, except that he is really good at tracking down people. Therefore, it seems strange that he simply gives up as soon as his telephone is destroyed and he can't receive communicate with the Baron. Earlier episodes clearly show that B100 does not necessarily need the GPS system to track down Bassie and Adriaan. Also, B100 could have easily used a phone booth for communication with the Baron, so why not use this instead?
Danny says an atom is the smallest part in existence and claims it can't be split. Atoms can certainly be split. The entire technology of atomic bombs and nuclear power plants are based on this.