I thought Rhaegar was excentally cast, it is mentioned in the book that Viserys looks like scrawny Rhaegar.
I definitely think that Tyrion made a deal with Cersei, this would also play into the prophecy that Dany will be betrayed 3 times. This one would be for love, as in Tyrions love for his family.
Aiden Gillen was absolutely fantastic in his death scene, amazing.
Loved how they shot Jons reveal, with him and Dany. Especially when Bran says about Rhaegar that "he loved her." and it shows Jon. "And she loved him." Dany looking at Jon.