Matthew Waterhouse got off to a bad start with Peter Davison after he took it upon himself to point out mistakes he felt the new star was making.
Peter Davison has said he didn't enjoy this serial because he was new and didn't feel he knew what he was doing.
The episode establishes the date of Logopolis and the opening scenes of Castrovalva: Part One (1982) by revealing that the flight Tegan was trying to catch in Logopolis was flight A778 at 1730 on 28 February 1981. This retroactively set Logopolis on the same date as it was broadcast.