In 27:3-4 Yitzhak tells Esau that he is soon going to die and he should go trap a deer and make food so he can bless him. He was very specific about what he wanted Esau to bring him.
Was Yitzhak really so concerned on his deathbed about what his last meal would consist of? Why didn't he just say bring me something to eat so I can bless you? Whyw as he so concerned with the specifics? And why is he so concerned about what's for dinner at such a critical time?
The Seforno suggests that he requested food from Esau because he wanted Esau to perform this mitzva of honoring his father so the blessing would have a mitzva to take effect upon, because Yitzhak knew that Esau was not really a worthy person (even if he did not know how bad he actually was, he at least knew this).
But it still seems out of place that Yitzhak gave such specific instructions. He could have just said to bring him dinner and the mitzva would have been accomplished the same.