The meerkats Youssarian and Zaphod are named after two rebellious characters from satirical and humorous literature: the insubordinate John Yossarian in Joseph Heller's "Catch-22", and the egocentric Zaphod Beeblebrox in Douglas Adams' "The Hitchhiker's Guide to the Galaxy".
Stinker is called "Sondheim" in the US version.
The show is narrated by different individuals in different countries, including Bill Nighy for the UK version (which is the original), Sean Astin for the USA version, Pio Terei for the New Zealand version and Mike Goldman for the Australian version. Stockard Channing took over for Sean Astin in Season 4.
Tosca the Meerkat got radio-collared by people from Cambridge University after she took over leadership over the Whisker splinter group.
Tosca the Meerkat gets her radio-collar removed after only having it for a short while, since Flower the Meerkat found the splinter group and re-seized autocracy at the end of last episode (evidently normal Cambridge University procedure is to only have meerkat leaders collared).