The Fifth Doctor's costume was put together through various sources. The coat and trousers were originals taken from a Doctor Who exhibit. The original jumper had faded so a new one was knitted for the show. The hat was a new panama hat with an original hat band added. The trousers used in the special had extra fabric sewn in the bottom, having been altered for Colin Baker when he briefly wore the costume during his debut as the Doctor.
In interview with Doctor Who Magazine that was released prior to the broadcast of Time Crash, writer Steven Moffat confirmed that "Time Crash" is considered part of the official Doctor Who canon. (There is a cutaway at the end of the preceding regular episode, "Last of the Time Lords" which allows for "Time Crash" to occur between that episode and "Voyage of the Damned".)
In addition to the spectacles and trainers, David Tennant's Doctor also exhibits exceptional skill with a cricket ball during the regular series, another characteristic he inherited from the Fifth Doctor.
Peter Davison regarded Graeme Harper as the best director he had worked with during his tenure on the series in the 1980s. Harper had directed his final story, The Caves of Androzani: Part One (1984). Harper was the only director of episodes of both the revived Doctor Who (2005) series and the original series, Doctor Who (1963).
Until the casting announcement of Matt Smith as the Eleventh Doctor in 2009, Peter Davison was the youngest man to play the Doctor at age 29 when he first took the role. He was 56 at the time this was filmed, older than William Hartnell was when he originated the role of the Doctor.