Theory:SJA television discontinuity and plot holes/Revenge of the Slitheen


 * No explanation is given for the absence of Kelsey Hooper.
 * She might have moved school/house, or just simply stopped keeping in touch with Maria.


 * How does Mr Smith know of Abaddon, The Beast or the Macra?
 * Macra have appeared in Earth's past (during the classic series of Doctor Who), and seeing that Mr. Smith is an amazing super-knowledge 'Xylok, why not? Also, Abaddon and The Beast have existed before appearances in Doctor Who and Torchwood, so there is a chance he/it picked up information from the events.


 * The speed of light is still not enough for the effect of the Sun being drained to be instant, it would take days, if not weeks for the sun to "go out".
 * Maybe the Slitheen also turned out all light from the sun, thus causing light still travelling to us to also be turned off.
 * Plus, it only takes just over eight minutes for light to travel from the Sun to the Earth. Maybe there is an eight-minute gap between the Slitheen 'switching off the Sun' and the scene where we see the Sun actually 'go out'.


 * If the Slitheen's device absorbed all nearby energy, shouldn't the various types of energy (electrical, chemical, heat etc.) in living organisms be absorbed too?
 * It wasn't all drained at once. Perhaps the sun had the most energy and was 'weak' to the tech and was absorbed first.


 * Mr. Smith brings up a world map before Sarah-Jane says it.
 * He might have been monitoring her brain patterns and predicted that she would ask for one.


 * When Glune Fex Fize Sharlaveer-Slam Slitheen explodes, Maria Jackson and Clyde Langer get covered in a different substance to what Jackie Tyler and Mickey Smith get covered in (World War Three). If it is the same family and species, why is it a different substance?
 * It could be some form of evolution or maybe the Slitheen family are made up of different species who are made up of different substances (like how humans have different blood types).
 * It could also be due to the differences between the specific vinegar used and the temperature at the time.


 * When Luke said what he did about the fact that the machine would explode if it took in energy from the sun, was he making it up? It would've been a good idea as it did allow him to get close to the machine, but he's shown to not know what a bluff is so I'm not sure about whether he could've actually lied either.


 * After Sarah Jane and the others stopped the Slitheen, she called UNIT about the machines in all the schools to get them dealt with. How long did this take because there were ten schools the Slitheen had taken over so wouldn't it have taken a while to deal with it? (I know UNIT's a worldwide organisation, but still.) And I get that the schools would've had substitutes cover the missing teachers (the Slitheen who killed them and inhabited their bodies having either been killed themselves or retreated and left Earth), but Blakeman was a headteacher. Who took over his roles as the head after he "disappeared"? (Considering Haresh stated himself as Blakeman's replacement in The Day of the Clown which happened a year after this one took place.)
 * As someone who works in a school, I imagine that one of the deputy heads would have covered the headmaster's duties whilst they looked for a replacement.