Oli, I'll have to look at that Neri scene again, but what I recall is he follows Rocco to the sliding door, stops, turns around, and grabs a cigar from a box on the coffee table. Your point about his possibly not wanting to be excluded would fit with my long-standing theory that he was trying to edge out Tom to be #2.

I didn't conclude that Fredo had never been to Cuba before. As he told Michael, "Havana's my kind of town." It'd be logical that Fredo, involved with gambling and whoring in Nevada, would want to visit Cuba.