The name of Thrinaxodon is not used in the documentary for which it was used as a model. It appears all over the place though under its own name. Thrinaxodon is included in many other media, including illustrations and toys. The animal appears in popular card games and in the set of collector's cards shown below.
In 1982 South Africa put Thrinaxodon on a stamp also. In a more realistic vein, UT Austin's Digimorph collection is supplemented with a Thrinaxodon skull. My favorite popular culture mention of Thrinaxodon, however, comes from Wizards of the Coast's long standing collectible card game Magic: The Gathering.