Fredo later says he didn't know it was going to be a hit. Now I realize Fredo is stupid, but what other earthly reason would there be for him to open the drapes unless it was going to be a hit. So either Fredo lied to Mike about his role in the hit, or someone else opened the drapes.
"Io sono stanco, sono imbigliato, and I wan't everyone here to know, there ain't gonna be no trouble from me..Don Corleone..Cicc' a port!"
"I stood in the courtroom like a fool."
"I am Constanza: Lord of the idiots."
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