Info text (occasionally rendered info-text, also known as production information subtitles) is production information put onto a secondary subtitle track on Doctor Who DVDs. It is a feature virtually exclusive to the DVD releases of pre-1996 episodes of the show.
The information varies on each release. It may include things like ratings figures, casting information, uncredited personnel who worked on a serial or details about how a particular scene was filmed. Often, the info text concerns itself with what might have been: locations or actors the production team couldn't contract, other roles that the actors then on-screen turned down and the like. Only rarely does the info text deal with continuity issues within the narrative itself.