Doctor Who: 14 Cool Details In Steven Moffat & David Tennant's Silence In The Library Commentary
1. It Was Moffat's Idea To Put The "Next Time" Trailer AFTER The Credits
It's a NuWho tradition for every single episode to carry a "Next Time" trailer somewhere near the end, and while there are exceptions (The Pandorica Opens ends with a simple "To Be Continued" graphic, for example), it's pretty much a rule at this point.
Silence In The Library is no different, with a short tease of the next episode (Forest Of The Dead) popping up at the end of the credits, and right at the end of the commentary, Moffat says that this was actually his idea.
After watching Series 1's Aliens Of London and being annoyed at the fact that the next time trailer was played before the credits (a decision that received a lot of criticism from fans at the time), Moffat apparently suggested that next time trailers that bridge two-part stories should be played after the credits instead.
This trend - which began with Moffat's own two-part story The Empty Child/The Doctor Dances in Series 1 - is so people can escape their televisions before seeing any spoilers for the next episode. Thanks Moff.
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More Doctor Who details are just a short TARDIS trip away! Click the episode titles for breakdowns of Blink, The Time Of Angels and The Eleventh Hour.