Aware of Sarpsborg 08 being founded in 08
The system for entering league history is susceptible to errors like the ones you mention, and especially in cases where you have a number of very similar club names. Most likely the 1978 league history entry you mention is Sarpsborg FK being typed in as just Sarpsborg (which is the short name for Sarpsborg 08 in-game). I will have a close look at the history of Sarpsborg 08 and weed away these errors, it's a simple fix, so thanks for pointing it out. I will consider removing Sarpsborg as the short name for Sarpsborg 08, to make the whole club name situation down there a little less ambiguous.
And I think you're right about the collaborations as well, there are very few instances of a collaboration being eternal.