Oh... those are the worst. 
I think the worst glitch I've ever had is when Esbern comes to ask you to talk to Delphine and him (because I had forgotten about them). Once I talked to them, Esbern would zip to wherever I fast traveled and ask me to see them again. Ugh. Make sure that when you complete the game you talk to them immediately, otherwise you may get this annoying glitch!

I think the worst glitch I've ever had is when Esbern comes to ask you to talk to Delphine and him (because I had forgotten about them). Once I talked to them, Esbern would zip to wherever I fast traveled and ask me to see them again. Ugh. Make sure that when you complete the game you talk to them immediately, otherwise you may get this annoying glitch!

That sounds annoying. When I beat the main questline, the "kill paarthurnax" quest suddenly appears and I had no choice but to accept it. This happens right after Paarthurnax does his little speech and flies off. So when I go to Sky Haven temple and talk to Esbern he says killing paarthurnax must be done. No choice in the matter whether I can accept this mission or not... it's really fricken annoying.