In the color animated version made available for streaming online, as the Doctor is rummaging through the trunk, a button appears and disappears on his lapel. It is the "Vulcan Earth Examiner Accord Every Access" pin he doesn't acquire until after he exits the TARDIS. The black-and-white animated version of this episode as aired did not have this error.
When the black-and-white animated version aired on BBC America, guide data provided to TiVo DVRs reported it as being part of the new Doctor Who series, not the original 1963 series.