Theory:SJA television discontinuity and plot holes/The Lost Boy


 * The Slitheen are said to be returning to Raxacoricofallapatorius, however it was established in DW: Boom Town that they face execution if they ever set foot there again.
 * Only Sarah Jane says they are going to Raxacoricofallapatorius - she may be unaware of this fact and assumes they are returning to their home world (or has been falsely told that they will).


 * Why would a police inspector have a confidential UNIT file on Sarah Jane -- complete with clear reference (visible on freeze-frame) to how and why UNIT was founded?
 * Possibly UNIT heard about Sarah Jane, or she contacted them, and they sent the file to cover for her. A Chief Inspector (his rank as given in the episode) would be cleared to see confidential documents as part of his job, also it is only a confidential version of the file. The original file may have a higher classification and this version may have sections censored or removed.


 * The child Slitheen's voice is different than that heard in Revenge of the Slitheen.
 * The voices of Slitheen always change when they assume a new disguise.


 * Why does Mr Smith send the meteor away in Whatever Happened to Sarah Jane?, when his goal is to let his fellow Xylok out of the Earth's crust?
 * The impact of a meteor, while devastating to life on Earth, is nothing compared to the scope of bringing the moon colliding with Earth. He obviously needed a much larger geological impact.


 * Chrissie doesn't seem to be the least bit perturbed to see Luke back with Sarah Jane at the end of the episode. She was the one who phoned the police about Sarah Jane having Luke in the first place, so why would she not say something about her having him back?
 * She now knows that the story about Luke being abducted was a deception.


 * How did Mr Smith close the door, and if he could then why didn't he do that to stop, Sarah Jane, Maria and Alan when he was shooting at them earlier in the episode.
 * Mr. Smith has been shown to be able to produce an energy field strong enough to repel a meteor. Producing a field capable of closing a door seems likely enough, if he focuses on doing such.


 * Sarah Jane refers to Krakatoa as the most powerful vulcanic eruption civilization has ever seen, but the eruption of Mount Tambora was more powerful